yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy A20 Guides, News, & Discussion] UnwashedLake55:
Hello. I am certainly not new here on XDA but I am a new user for Galaxy A20 which was a hand me down from a family member. Anyway, my question is this:

I really want to flash Descendant Q GSI on my Galaxy A20 which is running on stock rooted official android 10. Also rooted my A205GN/DS using [MENTION=5440376]physwizz[/MENTION]'s tutorial and was successful. also installed Magisk 20.4 on it too. The builld number I have is A205GNDXU6BTG3. I believe it is binary 6(?) with a July 2020 android security patch level. here's where my dilemma comes from.. because the steps i know ( which is limited ) in flashing a GSI are as follows: reboot to twrp — wipe cache, dalvik, data and system — flash GSI ( Descendant ) — flash Disable DM verity and then flash Permissiver_v5.zip — wipe ( again ) before rebooting to system

I haven't tried the above instructions myself because i don't want to hardbrick my A20 ( which happened to my J6 ). anyway, can someone please shed some light on my situation before I dive head on and flash the said GSI. Thanks in advance!

---------- Post added at 06:44 AM ---------- Previous post was at 06:43 AM ----------

Hello. I am certainly not new here on XDA but I am a new user for Galaxy A20 which was a hand me down from a family member. Anyway, my question is this:

I really want to flash Descendant Q GSI on my Galaxy A20 which is running on stock rooted official android 10. Also rooted my A205GN/DS using [MENTION=5440376]physwizz[/MENTION]'s tutorial and was successful. also installed Magisk 20.4 on it too. The builld number I have is A205GNDXU6BTG3. I believe it is binary 6(?) with a July 2020 android security patch level. here's where my dilemma comes from.. because the steps i know ( which is limited ) in flashing a GSI are as follows: reboot to twrp — wipe cache, dalvik, data and system — flash GSI ( Descendant ) — flash Disable DM verity and then flash Permissiver_v5.zip — wipe ( again ) before rebooting to system

I haven't tried the above instructions myself because i don't want to hardbrick my A20 ( which happened to my J6 ). anyway, can someone please shed some light on my situation before I dive head on and flash the said GSI. Thanks in advance!
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
We used permissiver when we were installing Q GSIs on Pie roms

it's not needed if you are on Q

Backup boot, data & system before you start with GSIs

More custom roms here

https://xdaforums.com/galaxy-a20/how-to/android-10-q-guide-a20-t4095589
[Samsung Galaxy A20 Guides, News, & Discussion] UnwashedLake55:
thanks for answering. i already have my back-up. so, the steps i listed are correct in order for me to flash a gsi on my A205GN. should i wipe everything again after have flashed said gsi? ( i.e. dalvik, cache etc )
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
Wipe both caches, data system

flash GSI

reboot
[Samsung Galaxy A20 Guides, News, & Discussion] Dan225:
GSI installed succefully on A205F ! But

Internal storage is encrypted,

Fingerprint don't work

Camera don't work (can't access Internal storage)...
[Samsung Galaxy A20 Guides, News, & Discussion] Dan225:
SOLVED !!!

After a full wipe(dalvik, data, cache, Internal Storage, and system), I restored my first backup (data, system and boot), rebooted the phone and reboot to TWRP to make a full wipe again. Internal storage is ok now !

Fingerprint always don't work in this GSI and I need a better camera app.
[Samsung Galaxy A20 Guides, News, & Discussion] Dan225:
Havoc OS installed successfully ! Beautiful ROM!
[Samsung Galaxy A20 Guides, News, & Discussion] Engineer_Virus:
Link please [MENTION=5623086]Dan225[/MENTION]
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
Congrats
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
Floko Rom looks good if you like tweaks but no GApps
[Samsung Galaxy A20 Guides, News, & Discussion] Dan225:
https://sourceforge.net/projects/ha...ab-Official.img.xz/download?use_mirror=freefr
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
These ones worked for me

1. AOSP 9 v119

https://github.com/phhusson/treble_e...tions/releases

2. Floko

https://drive.google.com/drive/mobil...VVXXJ5-MUVAsSq

3. Arrow

https://sourceforge.net/projects/arr...arrow-9.x/GSI/

4. Havok

https://xdaforums.com/pro...oc-os-t3930030
[Samsung Galaxy A20 Guides, News, & Discussion] Dan225:
I don't find a working gcam until now. Can you help me ?
[Samsung Galaxy A20 Guides, News, & Discussion] IamTheBRAVE:
From the v119 repo, i tried the system-arm32-binder64-vanilla-no su. It worked fine too. Just during install found it needs arm32 GApps but gsi took so much space i could only flash the pico ( bare minimum) version. Also don't know why but bith su and nosu version installs superuser along the magisk from TWRP. And AdAway not requesting root access (needs a downgrade of magisk to 17.3)

Ps: can you all take a look at about>phone info in settings and see if phone number is showing?. Text and call working right?Contacts App showing list of contacts? My mobile data only works after turning wifi on and off. [MENTION=2063076]Phys[/MENTION]wizz Do you think i could flash efs as tar in odin alone?
[Samsung Galaxy A20 Guides, News, & Discussion] alexHdz:
Cau u test this rom: https://github.com/phhusson/treble_experimentations/releases/tag/v200

I guess is Good idea, IT work most better in Samsung devices.
[Samsung Galaxy A20 Guides, News, & Discussion] Agrim720:
First of all

Not get good experiance in gsi lots of bugs.

I will make modded version of stock and post it later. when i get time and need someone to make custom kernel i can help u with that.. Cortex A73- 1.6Ghz wtf?..

lets Overclock it to the real one exy7885 2.2ghz so we can feel the phone buttery smooth if anyone intrested with custom kernel pm me i can help tho...will post modded stock later..its in the works.

---------- Post added at 07:56 PM ---------- Previous post was at 07:52 PM ----------

if u ppl have intrest in gsi need to make custom vender+kernel to get all the funtionallity otherwise gsi on our device not worth it+ its too much underclocked exynos7885 from samsung i dnt know what they are thinking and also ril is closed so volte not avble.
[Samsung Galaxy A20 Guides, News, & Discussion] IamTheBRAVE:
Very interested in this. A custom vendor/kernel would great. Thanks for proposing ?
[Samsung Galaxy A20 Guides, News, & Discussion] TBM 13:
Here it's the zImage with the MTP patch: https://drive.google.com/open?id=17lyBN4n01regMeUEBIi2hIf5pKjvFbAi

Unpack the boot.img from your A20 with Android Image Kitchen, go to split_img and replace the zImage file with the one in this reply.

Curiosity: In the build instructions of the README_Kernel, a line says "make exynos7885-a10_defconfig" so that could mean that our kernel is based on the Galaxy A10 one.

Sorry if my English has some problems :D
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
Yes phone number listed as unknown.

Everything working fine
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
Trying Android 10 soon
[Samsung Galaxy A20 Guides, News, & Discussion] Theus01:
I tried this rom android 10 aosp gsi AB arm64 and gave it bootloop

A520G
[Samsung Galaxy A20 Guides, News, & Discussion] jajk:
[MENTION=9333202]Agrim720[/MENTION] It would be fantastic to uncripple our Soc that is so underwhelming..... a comparison with A30 kernel code should point the way ;) [MENTION=9120939]TBM 13[/MENTION] Having difficulties booting back into GSI ROM at the moment but will report success or fail on MTP fix when it is back up and running.
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
What does your backup consist of?
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
Same for me
[Samsung Galaxy A20 Guides, News, & Discussion] UnwashedLake55:
Is it necessary to backup data ( in twrp )? or can i just backup boot, system and vendor from twrp. because i regularly backup my stuff using smart switch ?
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
I always backup data
[Samsung Galaxy A20 Guides, News, & Discussion] UnwashedLake55:
Okay. I have a new problem :( I managed to flash Descendant X GSI on my A205GN. But then I didn't like the look and feel of the said GSI so I decided to go back to my previous working rom which is a stock android 10 rom. Here's the things I did:

1. I rebooted to twrp

2. wiped everything ( dalvik, cache, data and system )

3. restored my twrp back-up ( boot, data, system and vendor )

4. rebooted to system

Now I am stuck on the samsung logo :( can you please help?

I also tried formatting data ( by typing yes then installing dm verity ) but I'm still stuck on the samsung logo. what did i do wrong? cause i am really stuck on what to do :( and this is the only mobile phone that i have :( do i need to download the official firmware then flash that using odin?

thanks for your help in advance if ever
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
Do a factory reset from TWRP
[Samsung Galaxy A20 Guides, News, & Discussion] UnwashedLake55:
I already tried it :( I waited for my phone to boot but it is still stuck at the Samsung logo :( what else can I do? :(
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
Install ultimate Q or Zrom
[Samsung Galaxy A20 Guides, News, & Discussion] burningcreation:
Sometimes it can't take some time at first boot. Just give it a bit more time and see.
[Samsung Galaxy A20 Guides, News, & Discussion] UnwashedLake55:
:( I waited for almost an hour and nothing. still stuck at the samsung logo :(
[Samsung Galaxy A20 Guides, News, & Discussion] Guyplay:
Corner Fix A20

help, I installed a20_cornerfix.zip and it didn't work my border is cut off the time and the battery needs help speak the step by step and attach the file that works
[Samsung Galaxy A20 Guides, News, & Discussion] DannyboyV845:
Hey guys,

I installed the Pixel Experience ROM on my A20E , works well, but I do not have a working second camera. Any fix for this? (The Phone sees the front camera twice, and does not see one of the cameras on the back.)

Any help would be appreciated.
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
GSIs all have some kind of issue.

I'm glad you got it working on your a20e
[Samsung Galaxy A20 Guides, News, & Discussion] reydoxs:
can not figure it out

i have a205f. i unlocked the bootloader, installed twrp and magisk. wiped everything from the phone so the os is now the default one that came out of the box. I want install a custom rom. any one that is stable and clean. I'm reading up on the whole thread but it doesn't seem like i can figure out what method to use. there are so many options and so many methods and theres always the risk of bricking. It's all very overwhelming. can someone help me install a rom. sorry for being such a noob im really to all this and this is the only phone i have so im trying not to take any risks here. Any help would be appriciated.
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
This is the best reference to it all

https://xdaforums.com/galaxy-a20/how-to/android-10-q-guide-a20-t4095589

try z-rom v5

https://xdaforums.com/galaxy-a20/development/z-rom-q-v5-t4175913

1. Backup data

2. Wipe caches, boot, data, system

3. Install Rom

4. Format data and then Install dmverity

5. Wipe caches

6. Reboot to recovery

7. Reboot

8. Wait a long time

9. Skip everything

10. Reboot to recovery

11. Restore data

12. Reboot
[Samsung Galaxy A20 Guides, News, & Discussion] butchieboy:
[MENTION=5440376]physwizz[/MENTION]

How you doing my friend. Long time no talk.

My Rooted SM-N986U using Tapatalk
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
All good

What happened to your A20?
[Samsung Galaxy A20 Guides, News, & Discussion] butchieboy:
I moved on to 10+..and 20ultra..10lite..been buying to much. Lol. Referred back to your thread to see if I could get any of the Gsi to work on 20 ultra

My Rooted SM-N986U using Tapatalk
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
I don't use GSIs these days
[Samsung Galaxy A20 Guides, News, & Discussion] butchieboy:
Yeah I tried a Pixel Gsi but went back to One Ui 2.5 rooted

My Rooted SM-N986U Tapatalk
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
You can make your own kernel

https://xdaforums.com/galaxy-a20/how-to/making-kernel-a20-t4173485
[Samsung Galaxy A20 Guides, News, & Discussion] TBM 13:
Did anybody try any Android 11 GSI?
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
Yes

I couldn't get the early beta version to work.

If there's a newer one it might be better
[Samsung Galaxy A20 Guides, News, & Discussion] emyaqin:
Hey, so I'm currently using Havoc GSI with Eureka kernel on my A205F and so far so good, but there's one little problem with my USB debugging witch I can't authorize or even revoke it. Could someone help me here, please?
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
What do you see with USB debugging
[Samsung Galaxy A20 Guides, News, & Discussion] wakang023:
Hi can i install this GSi on my samsung a20s

i want to install cyberpunk os or nusantra os

can u help me my device is sm-207F/DS
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
You have to root it first
[Samsung Galaxy A20 Guides, News, & Discussion] wakang023:
can u give me tutorial for samsung a20s how to install GSi and how to make the A only partition to AB ?
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
I don't know much about the a20s

Try to follow my instructions in this thread and let me know
[Samsung Galaxy A20 Guides, News, & Discussion] jajk:
Updated to XSA-A205YNDVS6BTL1 (Australian December update) and found that Samsung has created more inter-dependencies between their apps to stop certain users removing their spyware, adware and walled gardens...😡 Like a noose slowly tightening....

Not one to be readily herded, I have spat the dummy on persevering with a rooted and debloated OneUI stock ROM and have loaded the latest Havoc Quack Vanilla ROM (Havoc-OS-v3.12-20201230-Official-arm64-ab) to see how much progress has been made with GSI ROMs.

First impression is good. A good mix of useful customizations over the base Lineage and perky performance with Eureka v5.0 kernel. Will give it a good workout to see if there are any show-stoppers.

Edit: Tried latest PHH Android 11 GSI to see how that went.... It boots up nicely but reboots after a few seconds so a no go for now.

Havoc 3.12 is still behaving nicely.
[Samsung Galaxy A20 Guides, News, & Discussion] IamTheBRAVE:
If you're interested to test, there's a LineageOs gsi here

Also an ungoogled gsi called LeOs here

Currently having ZRom v5 which is heavily debloated stock so i might try them too...
[Samsung Galaxy A20 Guides, News, & Discussion] jajk:
@IamTheBRAVE I had a look at the LeOS ROM but it is based on the same PHH v300j GSI so probably inherits the same bugs. I tried the vndklite version of PHH roar because I still want to have /System RW. I also was running Eureka v5.0 permissive kernel and Magisk 21.2 at the time so that may influence the result of constant rebooting. Interested to see if anyone else has managed to get an Android 11 GSI running successfully on the A205?
[Samsung Galaxy A20 Guides, News, & Discussion] IamTheBRAVE:
Magisk is broken in R/11, we have to use PHH Su instead
[Samsung Galaxy A20 Guides, News, & Discussion] IamTheBRAVE:
Guess who was able to install PHH AOSP 11 GSI? This guy☝😁

It's running good, no reboot. Installed the vndklite-FOSS version to keep su. Needs some getting used to. Lots of jumping through hoops to get around Gapps,

-aurora store anonymous login not working so downloaded my apps from apkmirror.

-no youtube, the alternative NewPipe can't connect,

-Adaway is running as nonroot, root method needs magisk.

I installed using physwizz instructions, had Z-Rom v5 installed first (Kernel Eureka 4.4.3 Q/R)

Wipe caches, data, system

Flash arm64-vndklite-foss.img

Reboot.

Restore sms and call data ( tried the sms backup app but it restored messages, and call without contact names. Had to restore from sim)

I'll try the gapps version next week probably, can't see myself using foss apps indefinitely...
[Samsung Galaxy A20 Guides, News, & Discussion] jajk:
@IamTheBRAVE Thanks for reporting your success. I saw the PHH updates and was wondering if the reboot issue had been fixed.

I'll wait for Havoc to be released based on latest PHH 11 code.... gives it that extra little something that is missing in pure AOSP ;)
[Samsung Galaxy A20 Guides, News, & Discussion] IamTheBRAVE:
Now i'm interested in Havoc too😀. Downloaded a bunch of gsi to try (Caos R, LOS18.1, LeOs) will report back.

EDIT: running CaOS bvN now, same base as PHH. Didn't wipe data either. More to come...
[Samsung Galaxy A20 Guides, News, & Discussion] IamTheBRAVE:
Discovered that Superuser can be activated in PHH treble tweaks in settings, it's working.😄
[Samsung Galaxy A20 Guides, News, & Discussion] jajk:
@IamTheBRAVE What kernel/boot.img are you using for R11? Any major hardware bugs in latest PHH based Roar GSIs for A205?
[Samsung Galaxy A20 Guides, News, & Discussion] IamTheBRAVE:
I always use ZRom v5 as a base ( a Q custom rom is a prerequisite of GSI 11) it uses kernel Eureka 4.3.1 and frankly haven't noticed any hardware bugs but haven't used all features. (i'm using CAOS based on PHH's v300.l. Some software bugs (could be CAOS related) : some default apps not set ( dialer, messenger...) Resulting in InCallUI screen not appearing, can't hang up or answer calls (fixable). Also Play Services crashing when checking info so can't add gmail account (still not fixed).

I'm in the process of starting over fresh (vanilla this time then flashing gapps)

Is anyone else trying GSI 11? I can post the install instructions i'm using, with physwizz's permission...
[Samsung Galaxy A20 Guides, News, & Discussion] jajk:
@IamTheBRAVE I was trying to run with latest stock OneUI as base and Eureka r5.0 GSI kernel and have rebooting issues every few seconds. Have to conclude it is something in the stock Vendor partition and/or using Eureka r5.0.

Unfortunately most, if not all credible GSIs are based on PHH's incredible work and progress on Q based GSIs ended at PHH v222. This means we have no choice but to embrace Roar based GSIs into the future once they have less bugs than the last of the Quack versions....

Ever get the feeling we are all just Hamsters on a Hamster wheel?
[Samsung Galaxy A20 Guides, News, & Discussion] IamTheBRAVE:
@jajk you mean like this?

😄

Stock vendor did not work for me. I used ZRom 5. Attached you'll find the instruction from one website I more or less followed and the install procedure I used. Basically, you need to have a custom ROM (with vendor) then DM verity, then flash gsi ( multiple reboots and wipes/format in between cause TWRP doesn't show the fbe error right away only after system reboot-bootloop.

Now I have my base installed correctly and I switch gsi after wiping caches, system and format data. Sometimes when switching between variants, eg. BgS > BvS , some files subsist and create errors (happened on one gsi at least, so taking precautions)

Edit to add that I had constant random reboots with one gsi only (Corvus) didn't keep it long enough to investigate.

Now I'm on Caos BvZ + BitGapps (needs system partition resize) very satisfied with the result, might stay on it...
[Samsung Galaxy A20 Guides, News, & Discussion] Tn. Ferry:
guys, why can't the a20 device install the gsi rom android 11 ?? when it has been running for about a minute, the device auto reboots. kernel or vendor problems ??
[Samsung Galaxy A20 Guides, News, & Discussion] IamTheBRAVE:
Which gsi? Try another. Not sure what the problem is yet.

Try LineageOS 18 gsi, it worked well for me

Edit: the problem might be from system partition too small. Use Resize Partition in Twrp. My system went from 2.2 G to 4.5G. I was rhen able to install gapps.
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
That's it
[Samsung Galaxy A20 Guides, News, & Discussion] milosOnThePhone:
Hello 🙋‍♂️

Thank you for all the informations you share.

My phone is a Samsung SM-A202F/DS

I followed your instructions from post #2 Part "B. Android 10 (Q) "

The GSI I tried to install is crDroid (because I read on this thread it was working) I downloaded it from your post #1 https://sourceforge.net/projects/am...200104--v6.1-arm64-ab-vanilla.img.xz/download

I stopped at Step " 1. Installation ", I did not installed the Gapps etc.

My phone is booting a first time (Samsung Logo) and rebooting.

Again I got the Samsung Logo and then, the crDroid boot animation. I let my phone for more than 10 hours and still got this animation on the screen.

What would you suggest ?

Thank you very much !
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
I know that some people have got GSIs to work on the a202 but I have a a205

I also know that some have got Zrom 5 working with my kernel 1.56
[Samsung Galaxy A20 Guides, News, & Discussion] milosOnThePhone:
Thank you for your answer.

I am not sure of how to install the rom and the kernel.

I tried to flash the kernel (1.56) zip file using TWRP -> got a message: "couldn't find ramdisk" or something like that.

So I did it the other way, I flashed the ROM (ZRom5) (got a message saying "couldn't mount vendor...")

And I continued with flashing the Kernel, this time no message about ramdisk but still a message about the vendor.

I reboot my phone and got a bootloop with Samsung Logo.

Any ideas ?

Thank you !
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
Flash Magisk before the kernel

Restore vendor from your backup or flash stock vendor.img
[Samsung Galaxy A20 Guides, News, & Discussion] Tn. Ferry:
watch this bro ,crDroid 6.14 With AOD - Android 10 On Galaxy A20
[Samsung Galaxy A20 Guides, News, & Discussion] milosOnThePhone:
Thank you for your suggestion ;)

I tried it, but I get this error:

simg2img '/external_sd/A20e/arm64_bvN.img' '/dev/blockmmcblk0p25' process ended with error: 255

I had this error with TWRP 3.5, I flashed TWRP 3.4 like in the video, but still the same error.

Any ideas ?
[Samsung Galaxy A20 Guides, News, & Discussion] milosOnThePhone:
The image was corrupt. I flashed the image but got stuck on Samsung logo.

And in the video the guy has Eureka R5 A205 gsi permissive. Which i don't have.

And I think I would need an A202 version since I got a SM-A202F...
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
The only custom kernel available for the a202 is mine for OneUI.

A20e Root,Kernel and TWRP

https://xdaforums.com/t/a20e-root-kernel-and-twrp.4183683/
[Samsung Galaxy A20 Guides, News, & Discussion] milosOnThePhone:
Thank you for this information.

But at what step from your post #2 " B. Android 10 (Q) " should I flash the kernel (or what step should be replaced by flashing your kernel) ?

Or when you suggest me to use the Zrom5, what are the steps (using your kernel) to follow.

Excuse me but I don't understant everything like you do as I'm not often dealing with phones ROMs or kernels.

Thank's for your help.
[Samsung Galaxy A20 Guides, News, & Discussion] physwizz:
Fir GSI you must choose a GSI kernel,

flash it after the GSI
[Samsung Galaxy A20 Guides, News, & Discussion] munesh20200001:
Hi so I flashed evolution x android 10gsi on my a20 then flashed the magisk then fix DM verity then the permissive v5 and rebooted into system but when the device rebooted past the android logo it gave a blank screen and just turned off. I tried pressing all 3 keys then volume up to get into twrp recovery but got the same black screen I also tried to get into download mode with Odin but got the same black screen.
[Samsung Galaxy A20 Guides, News, & Discussion] IamTheBRAVE:
Try volume down and power. When it turns on and screen appears remove finger from vol down and press vol up. It will take a couple of tries. It should let you into custom recovery.