yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] 2gg1:
Changelog?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] LINGGV:
What's new in update 2019-9-14?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
https://review.lineageos.org/q/branch:cm-14.1

Always the same thing, lineage updates.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] D@nijel:
[MENTION=1619533]djeman[/MENTION]

RDS works ?

upload image
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] 2gg1:
Radio?

---------- Post added at 12:11 AM ---------- Previous post was at 12:07 AM ----------

Please make the option "disable hw overlays" on dev option enabled standard it will stop these weird lags!!!
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] fosphatic:
How to get SIM Card not found error on SM-J302F the dual sim card version fixed? Changing the boot.img from version 13 is not working causing a boot loop seems to be. Wiping and anything don't worked for me. I see even the screen that i should unlock the sim card and after code entry it is not recognizing the card at all. Beside the sim card problems the image looks very promising.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] coa.1996:
Is there still flickering problem?And if there is how can its impact be minimized? :D
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] pacurarelvis:
Disable overlay HW in developer menu put it to on
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] ardicli2000:
Make sure that there is no file in the folders called ".nomedia".

If thats the case, media scanner will skip the folder and wont show any photos for you.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Papaiamen:
Lineage 16 or 17 version is available for this phone model?

Where can i download it?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] borksek:
No
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Papaiamen:
What about Lineage 15?

There is the post here on xda but no link for download.

Do you have it?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] pacurarelvis:
Don't exist
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] borksek:
No!
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] dweller2:
Hello. Should I download Gapps for 7.0 or 7.1 for this ROM?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Benfatica:
7.1
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] dweller2:
Has anyone experience setting-up Google Family Link on custom ROM? After setting-up and rebooting I get FRP lock. I tried twice already, second time I manually commented out frp option in /system/build.prop, but it did not help. Any suggestions?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] sluchaen_fen:
Platform: ARM

Android: 7.1

Variant: pico
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] MrEAZ:
I do have the LineAge 15 version downloaded on my computer somewhere, why do u ask
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Eriosk_01:
I can't manage the micro sd. It can be fixed?

I also have problems connecting to the wifi with repeaters.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] 2gg1:
Really? Compatible with j320fn????!!
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] sluchaen_fen:
This ROM LineageOS 14.1 (Android 7.1.2) is best for Samsung Galaxy J3 (2016) SM-J320FN (j3xnlte).
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] borksek:
Fake.

Edit: unless he made his own sources or ported
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] 2gg1:
Which phone?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Cloud1710:
About Gapps, I need to download arm or arm64 for a SM-J320M?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] 2gg1:
Just the abovest one also dont downloud full gapps package. just the one with play store because sometimes the apps crashes. And you can download the apps you need on playstore.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Cloud1710:
So I'm looking for the ARM 7.1 Pico version, right?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] 2gg1:
Yes
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] 2gg1:
Whats new. Im happy theres still development.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Cees1958:
Yes great ??
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] ilsjako:
Bug or i have my settings wrong

When i am in my home country (Netherlands) the internet data roaming is working and I can also see the symbol LTE., i have internet.

But when i go to Belgium or Germany i have no internet anymore, the LTE symbol is gone. I have been looking at the settings for cellular networks but it isn't working for me anymore.

Any ideas?

Thanks Sjak
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] 2gg1:
Doe dit na elk herstart:

Ga naar instellingen - data gebruik - klik op de drie puntjes en kies mobiele netwerken- voorkeursnetwerktypen- kies iets anders dan LTE zoals 2G. Dan klik je weer op LTE. Dan wacht je even en als het goed is werkt het weer.

Laat me alsjeblieft weten of het werkte.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] ilsjako:
Bedankt 2gg1,

Ik zal het proberen als ik weer in Duitsland ben. Het kan wel even duren want ik weet nog niet wanneer ik daar weer zal zijn, maar zal het laten weten of het dan werkt.

Nogmaals dank.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] pacurarelvis:
Alow data roaming in phone settings network
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] ilsjako:
Data roaming is allowed, for the Netherlands and when i cross a border to Belgium or Germany.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] 2gg1:
Battery drains gast compared tot other roms
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] ilsjako:
Which rom would you then recommend?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] 2gg1:
the rom from edgar48 se 8.5 game life that today was deleted by mods didn't drain much battery. and also whit battery saver disabled..
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] ilsjako:
I have to charge my battery each day anyway.

Thanks.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] pacurarelvis:
Change battery it have 3 years
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
https://github.com/djeman/android_d...1212789#diff-1266e32bfe8142dc3fe87826463ac32f

Do one of you remember why I added this workaround ? :x

Because it's not very good with one apn for both data+mms ... I'm trying on my j3 without the patch and with 2 apns one for data and another for mms, both works.

j320fn test build without the mms patch => lineage-14.1-20191031-UNOFFICIAL-j3xnlte.zip

I read some things with "ro.telephony.mms_data_profile=5" to fix the problem of 2 apns but I do not need this ... maybe this bug was patched by lineage now ...

I'm trying to fix mms for a french guy ... yep I stopped the dev but mms are quite important so exceptionnaly I'm trying to fix the problem.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] 2gg1:
:victory: [MENTION=1619533]djeman[/MENTION] nice!!
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
Yep but ... so ... someone have a j3 here ? :D
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] pacurarelvis:
Yes I use my j3 since you made 14 versione on 2017
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Benfatica:
Yes
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
Yeah, I'm not alone :)

No one of you have found some sources of wpa_supplicant that uses libsecril-client to communicate with the sim ?

One guy have asked me for the eap-sim but as always it's a samsung implantation ...

I removed 2 errors on the ril to understand all the system to get eap-sim.

And I don't know if I remove my mms workaround or not ... I think I will remove it but I don't know if it's a problem except for me.

If I compile 2 new test releases (for the 2 models) you can try it ?

I lost my french guy with the mms problem ^^
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] sluchaen_fen:
J3 (2016) SM-J320FN Single SIM LineageOS 14.1 (version july 2019), pico GApps
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
The new release :

lineage-14.1-20191107-UNOFFICIAL-j3xnlte.zip

lineage-14.1-20191107-UNOFFICIAL-j3xlte.zip

A little changelog :

- october security patch added

- mms workaround patch removed

- ril driver patched to remove an error on all "chown" (unknown group id 8001 - Operation Not Permitted)

- permissions changed on /proc/cmdline to remove "permission denied" error from the telephony
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Benfatica:
Wow thanks, but there is one bug that has been worrying me for a while my network signal seems to be always low and I am on the j320fn version .
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Imi01:
[MENTION=1619533]djeman[/MENTION]

My father still uses J320FN. MMS are not working. I will be able to test this build at Saturday.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] expresspoet:
Hey everyone,

I got the F model and can't get the simcard working. Tried to flash the stock rom first, or lineage 13, tried the boot_test and the boot.img from lineage13 for the F model too, but still no sim card.... Would appreciate any help :)
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Imi01:
[MENTION=1619533]djeman[/MENTION] Did testing. MMS are still dead for me. Tried to reset APN. Tried to remove them and leave only 2. Log attached. Dirty flash over last realese from September.

EDIT

Also when trying to send mms it switches off celluar network. You need to turn off and on mobile data to fix it. I tested Lineage 14.1 on Honor 4C(P8 lite "almost"). MMS there works.

View attachment alogcat.2019-11-09-09-58-26+0100.txt

Wysłane z mojego Redmi Note 4 przy użyciu Tapatalka
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
[MENTION=2891177]lmi01[/MENTION]

So with this config :

<apn carrier="Carrefour Mova" mcc="260" mnc="01" apn="www.mova.pl" type="default,supl" />

<apn carrier="Carrefour Mova MMS" mcc="260" mnc="01" apn="mms.mova.pl" mmsc="http://mms.mova.pl:8002/" mmsproxy="212.2.96.16" mmsport="8080" type="mms" />

You have an error "Network is unreachable" when you try to send a mms.

I use this config and it works perfect :

<apn carrier="Free Mobile" mcc="208" mnc="15" apn="free" proxy="" port="" user="" password="" mmsc="" type="default,supl" />

<apn carrier="Free Mobile MMS" mcc="208" mnc="15" apn="mmsfree" proxy="" port="" user="" password="" mmsc="http://mms.free.fr" type="mms" />

So the difference is the proxy/port.

For the french guy with the mms problem is the same thing.

I/MmsService( 2044): [SendRequest@4d14761] HTTP: User-Agent=LineageOS

I/MmsService( 2044): [SendRequest@4d14761] HTTP: UaProfUrl=http://www.google.com/oha/rdf/ua-profile-kila.xml

And this maybe can be a problem, the user agent LIneageOS can be forbidden ...

You can check your user-agent on your honor 4C ?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Imi01:
I will check it in few hours. Also I will be unable to test it for few days on j3.

Wysłane z mojego Redmi Note 4 przy użyciu Tapatalka
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
Thanks, few days is not a problem ... the j3 is old, nothing is urgent and normally all development is stopped.

Me, I'm trying to reverse a part of wpa_supplicant to create a eap-sim patch for some samsung ril drivers.

But it's hard, I make just a try to test if I can pass the challenge :)

The beginning => https://pastebin.com/YBxXLm90
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Imi01:
[MENTION=1619533]djeman[/MENTION]

Log from sending mms on honor 4c. It works, but slow as hell. Same cellurar network and provider. APN are default. No need to remove and leave only 2.

View attachment alogcat.2019-11-09-18-42-02+0100.txt

Wysłane z mojego Redmi Note 4 przy użyciu Tapatalka
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] spirit_of_the_ocean:
The xnlte was for single sim right?

I still have that phone and without you it would be still running Lollipop.

So thanks a lot.

I an going to test it the next days. Anything special where to look at?

Greetings from germany
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Imi01:
xnlte is fn version

Wysłane z mojego Redmi Note 4 przy użyciu Tapatalka
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
I make some progress on eap sim/aka => https://pastebin.com/YBxXLm90

And maybe it was the problem for ims/volte, eap-aka is used for the authentification of the ims/volte ?

There is some weirds debug logs as "IPC_SEC_IMS_AUTH_TYPE_3G", "SRIL_IMS_AUTH_MAK_CODE_FAILURE", ... on the sim-aka authentification.

[MENTION=2891177]lmi01[/MENTION]

Have you "ro.telephony.mms_data_profile=5" inside the build.prop from the honor ?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Imi01:
[MENTION=1619533]djeman[/MENTION] I didnt find this entry. Attached build.prop from Honor. View attachment build.prop.txt

Wysłane z mojego Redmi Note 4 przy użyciu Tapatalka
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
Ok so it's not that.

Nothing is modified on the mms service but it not works for all ... your honor uses the 3g on rmnet1 and the j3 try to use the 4g on rmnet0 with no success ...

I will try another thing when I will got an idea :x

Thanks for logs and the build.prop.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Imi01:
[MENTION=1619533]djeman[/MENTION] Maybe switch to 2g/3g mode and then send mms? It shouldnt have meaning but in programming sometimes crazy ideas works.

Wysłane z mojego Redmi Note 4 przy użyciu Tapatalka
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] ilsjako:
[MENTION=9797691]2gg1[/MENTION]. I have tried it in Germany (switching from LTE to 2G,3G and back) but it doesn't work. Still no internet access with my sim abroad.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] marek287:
Did you found any solution to use Family Link?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] 2gg1:
Sorry, try ask the developers..
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] pacurarelvis:
Try to use magisk and you can hide root and everything and hide system to in this case work everything
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] kilocharlie57:
Can I update my lineage os without wiping my data?

Usually I would do a clean wipe and then update but is there an easier way to do this?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] ivan jo hann:
yes, you can, just do it.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] Imi01:
[MENTION=1619533]djeman[/MENTION] Any progress on mms?

Wysłane z mojego Redmi Note 4 przy użyciu Tapatalka
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] marko28:
No, and I give up, because I lost hours and hours installing official rom, after bricked phone OEM lock error. If You find something, please share here.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] FlyingJubbegaster:
There is a lot of info on installing a stock ROM in this 'https://xdaforums.com/galaxy-j3-2016/how-to/guide-how-to-flash-stock-rom-j3-2016-t3765677'. I have had this same problem multible times. There is never a easy way to resolve problems.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] AdarshB:
Hi there!

Does this ROM work on the SM-J320H variant of the Galaxy J3 (2016)?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] D@nijel:
For me MMS works... My monthly phone bill shows that ?

Im on Vip SRB (Serbia)
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] marko28:
Maybe i was not clear enough. I know how to install stock rom, there is no problem. Problem is that I always get "custom binary blocked by FRP lock" message on boot and i already installed official rom hundred times. I search for an option to sucesfully use Google Family link app with custom lineage rom.

thanks
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] MR207:
Anyone know how to modify data and system partition with adb? This rom weighs 715 MB but the system partition is 1,94 GB, so there are 1,2 GB of space unusable...
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] D@nijel:
Try with Resize partition in TWRP (but do that at own risk) ^^

Maybe this can help you:

https://xdaforums.com/redmi-2/themes/twrp-resize-partition-easily-t3803042
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] MR207:
Thanks i will try.

I tried to use "parted" with adb command... I tried to run "parted /dev/block/mmcblk0" with adb on twrp but don't work,if i do it when smartphone is switched on works, but if i do this when smartphone is on twrp don't work, but to resize partition i can't do this when smartphone is switched on... I don't undestand why adb command dasen't work on twrp. ("Parted" is installed on /system folder)

---------- Post added at 06:05 PM ---------- Previous post was at 05:57 PM ----------

I have 2 motherboard of this smartphone so i don't worry for brick

---------- Post added at 06:07 PM ---------- Previous post was at 06:05 PM ----------

https://xdaforums.com/crossdevice-d...uide-repartition-internal-storage-to-t3292159
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] D@nijel:
You can use TWRP Partition resize method?

I don't have second logic board to try this xD

(Look at that screenshoots:

)

Little hint: https://forum.hovatek.com/thread-17543.html
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] aminjomaa13:
twrp resize doesn't do anything. Can you please do a guide on how to do it, this would be very helpful.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] MR207:
Gdisk works.

I am trying to modify the partitions with gdisk, when I finish I write to you how to do it.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] aminjomaa13:
Much obliged.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] sluchaen_fen:
MMS problem

Possible reasons for the problem with MMS:

Old SIM or SIM has an old carrier name. Missing message setup from mobile operator.

2 years ago my bulgarian mobile operator changed its name from Mtel to A1, but I kept using the old SIM Mtel. I have not used MMS. This summer I installed LineageOS. The phone offered the default English language and found the mobile operator very slowly.

I changed the card to a new one without changing the phone number. I installed LineageOS again. The phone offered the default Bulgarian language and found the mobile operator very quickly.

The camera takes high quality.

Open Camera – settings – low/standard quality

Messenger does not have permissions.

Samsung Galaxy J3 (2016) SM-J320FN, single SIM

LineageOS 14.1 - 05 july 2019; Pico GApps; without SuperSU; MMS work
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] MR207:
This Rom with aroma gapps Is Better!
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
We have a samsung to modify partitions I think you need to modify the pit file before to flash it with all others parts in odin (CP, BL ... very important) ... it's more dangerous than all others flashes and do not forget to backup all before (efs, ...).

I never tried.

Pit magic do not seems to works perfectly but the file contains approximately that => https://pastebin.com/9h9zUvC8

To fix pit magic informations :

- "Block Size" is "Sector Start"

- "Block Count" is "Sector count"

And the sector size is 512Kb.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] sluchaen_fen:
TWRP Partition resize method don't work.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] MR207:
perfect I could try using it...

where did you find this file?
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] MR207:
I tried buy don't work becouse:

1 Odin daesn't find the file .pit

2 if i install the file.pit with odin i must install the firmware stock and if i install the firmware stock i can't modify the partitino becouse firmware samsaung Is bigger then lineage

---------- Post added at 11:26 AM ---------- Previous post was at 11:13 AM ----------

Anyway using gdisk and parted i mamaged to change the size of "userdata" partition but not the system partition, so gdisk work but I need to understand how to save the changes on the system partition. It seems that when i re-flash the rom, twrp re-partition my phone like before
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] MR207:
however if it were not possible to modify the partitions .. I recommend installing "aroma gapps" and not "pico gapps" this because aroma gapps is a graphical installation of the Google app and allows us to choose what to install, what we choose, is installed in the system partition in this way you save space in the userdata partition and you have more memory

---------- Post added at 05:28 PM ---------- Previous post was at 05:23 PM ----------

I'll modify system hidden and userdata partition with an hexadecimal editor, specifying start and end of partition.

I don't know how to use Odin repartition, i use adb command.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
Opengapps are fine, I never used pico it's too light.

Opengapps or thing aroma the two install the gapps inside system it's not really a choice but all updates are installed on data :x

So nothing changes, with aroma you have just some choices ^^

Yep with a shell and "dd" it's easy to dump and write any part of the emcc.

If you modify manually the partition table, you will be sure to do not touch partitions before "system" and so the recovery will always works.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] MR207:
Yeah but untill today i ever used pico gapps and i ever install Google apps as YouTube Gmail ecc from play store so i ever occuped userdata and not system partition ahahah
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
[MENTION=9022160]MR207[/MENTION]

I updated my partition scheme to add the gpt header, now it's complete => https://xdaforums.com/showpost.php?p=81245313&postcount=2509

I checked fastly on the hexadecimal editor and it seems to be simple to modify a partition.

In my partition table I have :

to dump the "gpt header" => "dd if=/dev/block/mmcblk0 of=/sdcard/gpt.bin bs=512 count=1024"

to write => "dd if=/sdcard/gpt.bin of=/dev/block/mmcblk0 bs=512 count=1024"

Example for a system of 1024MB :
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] MR207:
But after writing the file, the partition are changed? Install "link2sd" app It shows you data and system partition
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
Yes after a reboot, partitions are modified I think ... need to be tested but normally after a reboot it's modified.

But only the partition table so to make proper you must to format the 3 partitions.

Before to format maybe system will be continue to work but the 2 others have not the same adress.

If the start adress is not good it's not possible to mount it, the new adress it's not a partition first sector with some identifiers.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] MR207:
Anyway i tried to modify system hidden and userdata with adb command (gdisk) in an other devices "galaxy ace style" and then i flash on It cyanogen mod and twrp don't flash the rom, the phone don boot, but then i flash the stock firmware with odin and It works, so the phone works but now twrp don't flash the rom... It's realy Dangerous ahahah
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] MR207:
This Is after re-partition and don't work, work only Odin with firmware stock (galaxy ace style)
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
Not really, my twrp have adb so you can restore the mmc if something is not ok.

And yes I think you need to edit it manually because it's not a standard gpt.

First the header have not the good length compared to wikipedia ^^

And secondly each part entry have a guid and a name predefined.

system part entry => https://pastebin.com/XNVcSFPx

Edit: Maybe I will try for the proof concept ... my recovery have adb with dd ^^

If it works after a simple flash of the original rom with odin maybe we need to modify the pit also.

The pit file is include inside the csc part of the rom.
[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] MR207:
FINALLY I DO IT!!!

I Do It on galaxy ace style:

System from 1.1GB --> to 554 mb

Userdata from 2.3 GB --> to 2.8 GB

Before to do It cyanogenmod Is only 40% of system partition now Is 75%