yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy S8+ Guides, News, & Discussion] techlogik:
So am I understanding that you can't downgrade from Rev 2 to a 1? I've got G955U1UEU2AQK2 running on it. Tried about everything and get the: sw rev check fail fused 2 binary 1 error.

Then a reboot and phone wipes/resets itself and starts over from scratch.

Thought I've read enough...guess not, trying to Root this 955U1 phone, but from reading need the 1 version of firmware.

Thx
[Samsung Galaxy S8+ Guides, News, & Discussion] elliwigy:
thats always been the case wi5h any device lol

---------- Post added at 04:19 AM ---------- Previous post was at 04:18 AM ----------

also u cannot downgrade so ur waiting for root on rev2
[Samsung Galaxy S8+ Guides, News, & Discussion] techlogik:
Thanks, new to Samsung...so always been the case isn't really the case in my mind.

In HTC world..no problem, swap the firmware and change carrier all you want etc..plus bootloader unlock for modding/rom and still have safetynet etc..

Well...guess that brings us to the next question, is there thread for Rev2 rooting progress?

Thx
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
I haven't seen one. It might come eventually. Also I'm pretty sure people want rooted oreo.

---------- Post added at 02:08 PM ---------- Previous post was at 02:03 PM ----------

Hey there's a second factory binary for the s8+ out.

https://androidfilehost.com/?w=files&flid=233771

No info on a second one for the normal s8 though.
[Samsung Galaxy S8+ Guides, News, & Discussion] techlogik:
Sorry, but what does that mean?
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
The second factory binary means it's the factory binary with the second bootloader/engineering bootloader
[Samsung Galaxy S8+ Guides, News, & Discussion] cam30era:
FWIW: even on Nexus and Pixel devices (yes, and even on HTC), downgrading the bootloader is verboten. Generally, either the command will fail, or if it does succeed it will brick the device.
[Samsung Galaxy S8+ Guides, News, & Discussion] qwas12:
I am new to flashing and read a lot on this forum still does not understand difference between standard, carrier switch and unlocked.

i have s8 plus from ATT and want to go for unbranded FM, can someone help which method should i go for
[Samsung Galaxy S8+ Guides, News, & Discussion] jt1998:
what does unbranded FM mean? do you mean still use ATT but remove all their stock apps, etc?
[Samsung Galaxy S8+ Guides, News, & Discussion] qwas12:
I want Firmware which works all carriers. Similar to the one i get when buying a phone from bestbuy or samsung
[Samsung Galaxy S8+ Guides, News, & Discussion] jt1998:
don't believe you need to do anything. just install nextradio app from playstore, set it up, use headphones/earbuds and it should work.
[Samsung Galaxy S8+ Guides, News, & Discussion] jkhan49:
Go for the unlocked firmware method. Download the latest u1 firmware from updato and follow op.
[Samsung Galaxy S8+ Guides, News, & Discussion] alirz:
I have a Canadian G955W s8+ (the phone is sim UNlocked by the way, not that it should matter). Would like to flash unlocked fw. Just want some clarification from an expert or someone who has done this before.

After all the reading it seems i just need to flash the G955U1 using Odin Comsy and thats about it?

---------- Post added at 01:30 AM ---------- Previous post was at 01:21 AM ----------

May i ask, what is this new bin for? Im new to samsung and have done a lot of reading on various threads here. I have a Canadian G955W (s8+) that im trying to flash with unlocked. My research leads me to believe i need to flash G955U1 firmware using Odin comsy and thats all that should be required?
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
The new binary is for devices that have the second bootloader. If you have AQK7 and up you need it.
[Samsung Galaxy S8+ Guides, News, & Discussion] alirz:
---------- Post added at 01:47 AM ---------- Previous post was at 01:44 AM ----------

[/COLOR]

you said "If you have AQK7 and up you need it". yes i am on the November patch which is AQK7. Could please clarify i need the binary for what exactly? Is it to flash unlocked fw? (please be kind if that is a dumb question)

Bottom line, my issue is i want to know if i can just straight up flash G955U1 to my G955W using odin comsy? or are their other additional steps required for me to run unlocked firmware.

Thank you
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
You need the binary for carrier switching.

You dont need it for anything else.

Try both and see what works for the factory binary.

Also here's the BL2 HOME_CSC you need https://drive.google.com/file/d/1xsEvg6Ln9hvR5bwFX3sTgBCgwEMM50h0/view?usp=drivesdk

There's no additional steps to flash unlocked fw.
[Samsung Galaxy S8+ Guides, News, & Discussion] qwas12:
Thanks. just unlocked methid right, not to deal with any carrier switch i guess
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
Carrier switch is highly useful it removes whatever carrier apps and bootanimation your carrier puts into your phone...
[Samsung Galaxy S8+ Guides, News, & Discussion] alirz:
Not to piss anyone off. But it kindda sux to be getting half ass answers here.

Why would he need to do a carrier switch if he is flashing unlocked firmware? Wouldn’t that alone get rid of any carrier apps?
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
Nope firmware doesn't matter. The userdata image holds a file called cache.img.ext4 when you un encrypt that with sgs2ext4 it opens up to a file called sec_omc.zip inside that it holds carrier folders. VZW, CSC, AIO, LRA, etc. and in that directory is a file called sales_code.dat that holds your csc folder name ex. VZW. It applies the contents under the VZW folder to your system.
[Samsung Galaxy S8+ Guides, News, & Discussion] rich168:
Will this still work with the new bootloader?? bootloader 2

Thanks
[Samsung Galaxy S8+ Guides, News, & Discussion] alirz:
so my Canadian s8+ doesnt have any carrier bloat however it has some pre packaged apps from Samsung like Excel, Word, Facebook etc.. Are those included in the unlocked g955U1 firmware or can get rid of them by flashing the unlocked fw?

As i dont have any carrier related bloat, no carrier boot logo etc.. I assume i dont need to use the new binary to do a carrier switch? i can simply flash the G955U1 fw to my device and that should be all?
[Samsung Galaxy S8+ Guides, News, & Discussion] qwas12:
Mine is having older AQF7, so i think new binary is not needed
[Samsung Galaxy S8+ Guides, News, & Discussion] Tekken Lord:
For a carrier switching shortcut, I can confirmed that using Prince Compsy Odin to flash a carrier-specific firmware with the appropriate sim card inserted will switch the firmware to that carrier.
[Samsung Galaxy S8+ Guides, News, & Discussion] rich168:
successfully updated to unlocked firmware

did not do the carrier switching step as it was not needed

thanks
[Samsung Galaxy S8+ Guides, News, & Discussion] nhoc_maruko9x:
Is that true that Flashing stock firmware from a running stock firmware, without tick USERDATA, wont wipe any data on the phone, apps, contacts, messages, etc as long as you dont upgrade the bootloader version? I flashed 955U1 AQK2 to use bloat-free firmware, now I flash 955U BQK2 but nothing is lost and it's still bloat-free, so I feel a little confused here.
[Samsung Galaxy S8+ Guides, News, & Discussion] Mike15678:
It will? I need more people to confirm this actually works, as I don't have any SIM cards for any other carrier.
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
It's called BringYourOwnDevice/BYOD it was introduced in BQK5. I can't confirm it either because I don't have a sim card.
[Samsung Galaxy S8+ Guides, News, & Discussion] Tekken Lord:
AFAIK, Tmobile firmware switched to AT&T with my AT&T sim. In fact, my S8+ is the unlocked Verizon variant.

One big caveat is that an appropriate sim card must be in prior to cross-flash.
[Samsung Galaxy S8+ Guides, News, & Discussion] z06mike:
So you are all saying just do a regular odin flash using Prince's with the carrier firmware and it will go straight to that carrier firmware??

Also, do you think flashing the carrier firmware vs unlocked firmware will yield better signal??? The reason I ask is that i flashed my Verizon S8+ to the unlocked firmware and everything is working good, but signal can be spotty in some places with T-Mobile. Is there any advantage in that regard to getting better signal or is it the same difference (6 in one and half a dozen in the other type thing??).
[Samsung Galaxy S8+ Guides, News, & Discussion] blane3298:
i mistakenly updated to the new bootloader. will this still work?
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
Use these instead of the normal factory binary and home_csc

BL2 XAC HOME_CSC

https://drive.google.com/file/d/1xsEvg6Ln9hvR5bwFX3sTgBCgwEMM50h0/view?usp=drivesdk

BL2 Factory Binary

https://androidfilehost.com/?w=files&flid=233771
[Samsung Galaxy S8+ Guides, News, & Discussion] blane3298:
thank you sir!
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
You're welcome.
[Samsung Galaxy S8+ Guides, News, & Discussion] dv8ed:
I have an unlocked Verizon Galaxy S8+ accidently updated to U2BQK5. Can I use Prince Odin to flash SM-955U1 U2 firmware?

I’m not trying to downgrade to bootloader 1, just want to use bootloader 2 unbranded firmware.

UPDATE: Never mind I answered my own question it worked.
[Samsung Galaxy S8+ Guides, News, & Discussion] AngelRoker:
Hi guys, I have a question here.

I own a Sprint S8+ variant and I moved to Brazil recently. It's already unlocked and I can use any carrier I want but I have that awful "bug" dialing without country codes.

So I decided to switch to the unlocked firmware. During my research I got all the brazilian CSCs and my question is: Should I try to flash any other CSC with the unlocked firmware? Like ZTO (brazilian unbranded) for example or any carrier-specific CSC... My main target is get rid of the dialing bug but it would be nice to have those carrier's features.

Our network here is kind of similar to AT&T network including VoLTE, maybe I should try with their CSC first??

Thanks in advance
[Samsung Galaxy S8+ Guides, News, & Discussion] rich168:
No you have a snapdragon phone.. outside USA they have exynos
[Samsung Galaxy S8+ Guides, News, & Discussion] Tekken Lord:
Yes, you must have an appropriate sim card inside prior to flash your phone. I have tested with the latest BQK5 only firmware, not sure about other firmwares.

Better signal or not depends on your carrier. Furthermore, a carrier-specific firmware has Wi-fi calling and is optimized for its network. Unlock firmware is bloat-free (has Wifi-calling and HD Voice for certain carriers); however, I am not sure if it has better signals in individual use cases.
[Samsung Galaxy S8+ Guides, News, & Discussion] nhoc_maruko9x:
Just check for update with Smart Switch and it says there's a new firmware for unlocked 955U1 with code AQL1.
[Samsung Galaxy S8+ Guides, News, & Discussion] rich168:
Yes there is. I checked software update in my phone it's 44MB File OTA.
[Samsung Galaxy S8+ Guides, News, & Discussion] superflysocal:
I have the Unlocked US version bought directly from Samsung. I initially was able to put on the Tmobile firmware and it has been working fine. however, i recently dropped and damaged my phone so that the screen is cracked and the screen is mostly green and unreadable. Fortunately i have samsung premium care and I just have to pay the $99 deductible. However, i want to flash back to the original unlocked firmware before I send it back. Which steps do i have to do to get back to unlocked firmware? I will not be able to see much on the screen since it is damaged so can i do most things just by plugging into computer without looking on the screen?
[Samsung Galaxy S8+ Guides, News, & Discussion] Mr. Orange 645:
I have a similar question to the poster above me. I have a 955U1, which I long ago flashed with T-Mobile firmware, which has since updated to BQK5, which I know is the version 2 bootloader.

I wanted to flash back to the Unlocked firmware. I downloaded the most recent firmware, I believe AQL2 or something similar. Its the 955U1 firmware released in late December, and from what I read, it also contained the version 2 bootloader. However, when I tried to flash it with Comsy ODIN, it failed, and I got the error on the screen about 2>1. This indicates I was trying to flash V1 bootloader.

So my question, is there any way to flash back to the unlocked firmware, or do I have to wait for a "B" firmware release like BQK5?
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
That is strange because I know AQL2 has the 2nd bootloader... Sorry I don't know how to help you.
[Samsung Galaxy S8+ Guides, News, & Discussion] Reechings:
If you're flashing stock firmware images I would use newest version of regular odin.
[Samsung Galaxy S8+ Guides, News, & Discussion] waicool:
need to flash stock at&t firmware but i think my bootloader is v2

Hello,

I have an at&t s8+ and its been on stock firmware. I sideloaded the CRA1 oreo update that came out this week to try it out. Now I want to go back to Nougat. I got the at&t AQC9 firmware for the G955U from updato. When i try to flash it, i get the 2>1 error on the phone (i assume because the AQC9 firmware uses the older bootloader?). i don't see any newer at&t firmware on updato for the G955U.

In the G955U1 section, i see there are at&t firmwares up to AQL1. Would i use one of these? isn't G55U1 the USA unlocked model? Why is there a specific at&t version of it? any help is appreciated! thanks!
[Samsung Galaxy S8+ Guides, News, & Discussion] JeffATL:
Out of curiosity, did you ever get it to work ?
[Samsung Galaxy S8+ Guides, News, & Discussion] waicool:
ignore. i found a G955U BQL1 firmware to flash and it worked!
[Samsung Galaxy S8+ Guides, News, & Discussion] tdamocles:
What would be my best option to go to a firmware that has WiFi calling on MetroPCS and coming from a Xfinity S8 Plus? Should I use the unlocked firmware and Flash it with the SIM card inside (I see there is a 955u1 tmk version without userdata) or should I do a carrier switch to MetroPCS and then Flash the T-Mobile stock firmware. I think I'm on the 2nd bootloader version because I'm on the December patch BQL1 firmware for the Xfinity phone.? Can I flash the AQL1 955u1 tmk overtop since I cannot find a tmk BQL1 firmware? I would let like to get rid of the Xfinity boot screen and the Xfinity Visual Voicemail app that's on the phone. I did notice that when I did the Sim unlocking I inserted my wife's AT&T SIM card it actually changed the boot screen to AT&T and I think it added AT&T Visual Voicemail app but when I inserted the Metro PCS Sim the Xfinity boot screen came back and the Visual Voicemail app came back also. My about screen says that it is a cct/xaa/cct phone right now with the metropcs sim inside.

UPDATE:

I went for it and Flashed the AQL1 tmk 955u1 over top the Xfinity BQL1 and it Flashed without a hitch. I used the Comsy odin unlocked firmware method to do it with the MetroPCS Sim inserted when flashing.. It removed the Xfinity visual voicemail app and wifi calling works and also volte is now an option.
[Samsung Galaxy S8+ Guides, News, & Discussion] Mr. Orange 645:
I did actually! My S8+ was on TMB G955USQU2BQK5 (Nov Patch). I was trying to flash the XAA G955U1UES2AQL1 (Dec Patch). For some reason it was giving the bootloader mismatch error, even though its v2 bootloader, and is a newer firmware. So I downloaded the XAA G955U1UEU2AQK2 (Nov Patch), and it worked perfectly. For some reason, the S2 bootloader would not flash over top the U2 bootloader.

That is the most trouble I've had doing any carrier switching.
[Samsung Galaxy S8+ Guides, News, & Discussion] alirz:
I had a 955W (Canadian s8+). Decided to flash 955U1 on it zas per the steps on the first page of this thread, hoping to get faster updates now. Anyways, i notice that after boot, the briefly displays a notification saying " checking device status sprint omadm". I dont notice any issue, just wondering why i'm seeing this, i had nothing to do with sprint. I flashed the latest 955U1 i.e G955U1UES2AQL1 with XAA as region.

Screenshot: https://drive.google.com/file/d/0B2Gk6_4BkPn0cFJ0QUVQV3ZmZHBydE1STUpqN3NkZ3R6Rklr/view?usp=sharing

UPDATE: I notice that there are 3 sprint system apps installed on the phone. This is odd though. looks like they come with the 955U1 firmware for some reason.
[Samsung Galaxy S8+ Guides, News, & Discussion] Paliden99:
Bricked

I have the 8+ unlocked that was running G955U1UES2AQL1 before I tired to carrier switch to AT&T to get NumberSync and Wi-Fi VoiP to work. Now its a brick that will only boot to the Download screen. SmartSwitch can't identify the phone. I've tried just about all the suggestions from this thread and other. From Deleting the Flash and Repartioning with the extracted PITT file and nothing works. Odin just sits at one point in the system.img.ext4 and never progresses. I've let it run for 15 - 20 mins and its still stuck. I've tried Odin 3.12.7 and the Prince Cosmey Patch version with no luck.

I've tried using all of the files in each of these revs with no luck: G955U1UES2AQL1, G955U1UEU2AQK2, G955U1UEU1AQDC, G955USQU2BQK5, and G955USQ2BQL1.

Can some give me some advice as to what I can do to fix my phone other than send it off for repair?

Any help would be appreciated!!!

Thanks Again
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
Try flashing 2AQK2 with csc instead of home_csc or vice versa
[Samsung Galaxy S8+ Guides, News, & Discussion] alirz:
im really new at this so cant help much. but did you look into using the BIN file that was posted here a few threads ago. From what i have read that should be used to flash if your current bootloader is version 2. I will let someone with more experienced with samsung flashing comment further.

What ever its worth, i did my first flash today. Went from G955W to G955U1 without any issues. Now a further flash from here on now may not be as simple as i think. I guess iam at the point, from which you started and got yourself in this odd situation.
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
What bin file. I'm just wondering.
[Samsung Galaxy S8+ Guides, News, & Discussion] alirz:
I had flashed my G955W to G955U1 XAA. (All throughout the process my Canadian sim card was in the phone, not sure if that could cause any issues). However i notice that in the About phone section of my phonem the carroer service provider is only listed as "XAA//XAC". Thats right with three forward slashes. Shouldnt i see 3 CSC codes there? Im experiencing some odd behaviour on my phone and im wondering if it could be due to this.

1- After a reboot, my phone briefly shows a notification about SPRINT" saying "omadm checking device status"

2- After a few hours google photos stops syncing with google. Though i think this is some other issue not really related to the flash.

QUESTION!! if i should indeed had three CSC codes showing up on my phones, do i need the re-flash the U1 firmware again with no sim in the phone or can i just do factory reset with the sim card out. Please let me know. Thanks

UPDATE- i reflashed G955U1, XAA again on my phone while keeping the sim card out. Same result. I still have the above mentioned two issues.
[Samsung Galaxy S8+ Guides, News, & Discussion] Paliden99:
I got it working. Turns out that I was using the USB port from my docking station and that caused it to freeze during the installation. Now I have another problem. I can't change my call forwarding options it gives me a Network or Sim Card read error. I went to ATT and had the sim card replaced and the issue persists.
[Samsung Galaxy S8+ Guides, News, & Discussion] alirz:
im trying to understand the "samfirm" firmware download tool. I know what the CSC and PDA is. What is "PHONE" ?
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
Just put G955UOYN and the baseband letters after OYN
[Samsung Galaxy S8+ Guides, News, & Discussion] alirz:
Thank you soooo much for a reply. I was hoping that this thread was busy that i would be able to get an answer quickly but sadly that hasnt been the case.

Since you replied, could you please kindly read my post above # 495, link below, and provide any feedback. I'm really in a bunch at the moment. I've done several factory resets and even re-flashed XAA again. but its the same result.

My previous post: https://xdaforums.com/showpost.php?p=75150344&postcount=495

---------- Post added at 08:57 PM ---------- Previous post was at 08:52 PM ----------

That did not work.

My PDA: G955U1UES2AQL1

CSC:G955U1OYM2AQL1

PHONE: i dont know

If i try PHONE to be any of the above, samfirm tool gives an error

"Checking firmware for SM-G955U1/XAA/G955U1UES2AQL1/G955U1OYM2AQL1/G955U1OYM2AQL1/G955U1UES2AQL1

Error: Could not send BinaryInform. Status code 200/400

Request was invalid. Are you sure the input data is correct?"
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
Oh phone equals the PDA
[Samsung Galaxy S8+ Guides, News, & Discussion] alirz:
Nope, the PDA value is not accepted in the PHONE field.

Did you get a chance to read my post#445 above. I would really appreciate if you have any comment on that. That is a more important issue at the moment. Thank you
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
Set the region to XAA also you might not be able to download that off samfirm anymore. SamFirm only downloads latest firmwares.
[Samsung Galaxy S8+ Guides, News, & Discussion] alirz:
Thats what i've done. I download G955U1, XAA. samfirm does download the latest firmware( file info listed below). however after i've flashed it to my phone i only see XAA//XAC under the abount> carrier service info!! should i see three values? like XAA/XAA/XAC ?

Checking firmware for SM-G955U1/XAA/G955U1UES2AQL1/G955U1OYM2AQL1/G955U1UES2AQL1/G955U1UES2AQL1

Model: SM-G955U1

Version: G955U1UES2AQL1/G955U1OYM2AQL1/G955U1UES2AQL1/G955U1UES2AQL1

OS: Nougat(Android 7.0)

Filename: SM-G955U1_1_20171212130814_j00kpxxwoj_fac.zip.enc4

Size: 3200706864 bytes

LogicValue: 4ewbw6p0rxw9ae2m
[Samsung Galaxy S8+ Guides, News, & Discussion] xdanilva:
You should see XAA/XAA/XAC
[Samsung Galaxy S8+ Guides, News, & Discussion] alirz:
well thats the thing i dont. Now also note that i started with a original Canadian G955W. based on the steps on the first page, i only followed the steps of flashing the unlocked firmware. i did NOT did any steps for carrier switch as from what i figured thats not i was looking to do! i guess i was right with that thought at least?

im wondering if that is why my phone is behaving weird as explained in post#445 because i dont have the three codes listed as XAA/XAA/XAC .

Any thoughts what could be wrong? Can i simply flash back the G955W firmware using NORMAL ODIN to see if that resolves my issue?
[Samsung Galaxy S8+ Guides, News, & Discussion] alirz:
I decided that perhaps i did needed to do the carrier switch steps also. So i did that. then eventually back onto G955U1. So some things look better. previously my phone would not respond to any dialer codes like *#06# (to list the IMEI), *#1234# (to list PDA, CSC,CP). These are working now! so something has definitely improved. I also dont see the Sprint OMADM notification after reboot.

However, i was able to see the "carrier service provide" information under the About menu on the phone, there it would also show me the CSC and PDA codes like XAA//XAC . This time, the entire carrier service info section is missing so i cant really tell what is the status my codes i.e am now properly on XAA/XAA/XAC ? etc... i cant tell that anymore.

however google photos sync issue still exists
[Samsung Galaxy S8+ Guides, News, & Discussion] tdamocles:
I flashed 995u1eus2aql1 tmk version and I can't see the carrier service info either. I can pull #06# but not #1234#