Develop Bugs

[Q] Froyo Installation and Overview for Dummies?

Hi,
I'm just switching to a Android phone coming from a Palm Pre. I'm running a Linux only system since some years and have flashed my last 5 phones ( Palm, Samsung, Nokia, Motorola, Siemens ), so I'm no real noob. Now with Android I just don't get the Overview and some simple Instructions.
The Stock Defy runs Android 2.1 Motorola Firmware Version 2.35.xx or lower.
As I don't like the security flaws in 2.1, I'd like to upgrade to some higher version.
There are at least 3 possibilities to flash a firmware.
NANDROID seems to be some script collection. Booting into a recovery shell yet to be installed, I can flash a nandroid backup.
RSDLite seems to be the default Motorola Software for flashing a firmware. Files are *.sbf files. I need to install the Motorola USB driver and flash.
Clockwork MOD Recovery seems to work on a rooted phone. Following this thread http://forum.xda-developers.com/showpost.php?p=11012129&postcount=157, it sounds interesting. What files do I flash with this? sbf?
Version 3.4.2 155-002 Retail.en.CEE aka Finland III seems to be the latest stock firmware ( also for european devices ). But if this firmware is deblurred, it can't be stock, can it?
I need a starting point to flash a new firmware where everything will work fine ( maybe the UK froyo 3.5.2-117 ? ), and get into this whole thing.
I hope you can understand my problems.
-luth

Reinstall Android wear 2.0?

I had updated by using the spam update trick, but I had forgotten to reset my watch before that. Here are a few problems that accured because of that:
- unable to link Google account during setup. Was able to link afterwards after a bit of difficulty.
- Bluetooth keeps disconnecting from phone. Problem only started a few days ago.
- overall buggy performance. Even though it is rumered that a second core was enabled.
- suprisingly better battery life! That's not a problem isint it? :silly:
To solve these problems I tried resetting but to no avail. So the only thing to do is try reinstalling the stock firmware. I still have warrenty so I don't want to unlock the bootloader right now. I know that you can restore a stock system image on phones without unlocking the bootloader. I would prefer an 2.0 system image.
Is there a method available?

164 views and no comments.

Soneliem said:
I had updated by using the spam update trick, but I had forgotten to reset my watch before that. Here are a few problems that accured because of that:
- unable to link Google account during setup. Was able to link afterwards after a bit of difficulty.
- Bluetooth keeps disconnecting from phone. Problem only started a few days ago.
- overall buggy performance. Even though it is rumered that a second core was enabled.
- suprisingly better battery life! That's not a problem isint it? :silly:
To solve these problems I tried resetting but to no avail. So the only thing to do is try reinstalling the stock firmware. I still have warrenty so I don't want to unlock the bootloader right now. I know that you can restore a stock system image on phones without unlocking the bootloader. I would prefer an 2.0 system image.
Is there a method available?
Click to expand...
Click to collapse
To restore the stock 2.0 image without unlocking your bootloader, you would need the officially signed 2.0 firmware package from Google/Huawei. These packages are easy to get for phones because carriers will often have a "repair tool" that downloads the full package and flashes it. Once downloaded, the package is easy to capture and upload for everyone else to have. I'm aware of no such tool for the HW, and I don't think that Google posts the full firmware packages anywhere other than the 1.5 package that they posted on the AW 2.0 dev preview site.
So without unlocking your bootloader, the answer to your question is no. If you want to unlock it, you can flash the 1.5 image and then OTA back to 2.0.

TheSt33v said:
To restore the stock 2.0 image without unlocking your bootloader, you would need the officially signed 2.0 firmware package from Google/Huawei. These packages are easy to get for phones because carriers will often have a "repair tool" that downloads the full package and flashes it. Once downloaded, the package is easy to capture and upload for everyone else to have. I'm aware of no such tool for the HW, and I don't think that Google posts the full firmware packages anywhere other than the 1.5 package that they posted on the AW 2.0 dev preview site.
So without unlocking your bootloader, the answer to your question is no. If you want to unlock it, you can flash the 1.5 image and then OTA back to 2.0.
Click to expand...
Click to collapse
Thanks, that was my fear. I will restore to 1.5 and then upgrade. Thanks for your in-depth explanation.

Galaxy A3 FRP Unlock

Hello.
I've just discovered that I can't switch my phone on because it says "custom recovery block by frp lock". I know there are numerous threads on this forum and other websites describing this problem and ways to solve it, included mantaining data.
Every method requires the download of the same version firmware you had installed on your phone. The problem is that I cannot really remember if I kept my Galaxy A3 2016 to 5.1 or I upgraded it to 6.0. Obviously I cannot check it by phone since I cannot even boot, nor via adb since it isn't able to recognise the phone in the download mode.
So firstly: is there a way to retrieve the firware code, or at least, the android version of my phone? Can adb recognise the phone in downlaod mode?
Secondly. According to this link in xda, that user was able to solve the problem using some kind of firmware image (QB1), which seems to be an upgrade. Is that method valid for other samsung phones? For my A3, should I follow the same steps with the correct firmware version?
Thanks in advance

Frank-95 said:
Hello.
I've just discovered that I can't switch my phone on because it says "custom recovery block by frp lock". I know there are numerous threads on this forum and other websites describing this problem and ways to solve it, included mantaining data.
Every method requires the download of the same version firmware you had installed on your phone. The problem is that I cannot really remember if I kept my Galaxy A3 2016 to 5.1 or I upgraded it to 6.0. Obviously I cannot check it by phone since I cannot even boot, nor via adb since it isn't able to recognise the phone in the download mode.
So firstly: is there a way to retrieve the firware code, or at least, the android version of my phone? Can adb recognise the phone in downlaod mode?
Secondly. According to this link in xda, that user was able to solve the problem using some kind of firmware image (QB1), which seems to be an upgrade. Is that method valid for other samsung phones? For my A3, should I follow the same steps with the correct firmware version?
Thanks in advance
Click to expand...
Click to collapse
1.install KIES
2.press tools
3.press frimware upgrade and installation
4.device id is your device model and serial number can be found under battery
5. allow kies to download and install the image
Video link for more help : https://www.youtube.com/watch?v=LqoX7wNhotk
good luck
Edit: please remember to enable OEM unlock in developer options next time

Kies cannot link to the device in the downlaod mode unfortunetely

Frank-95 said:
Kies cannot link to the device in the downlaod mode unfortunetely
Click to expand...
Click to collapse
try using smartswitch and see if it detects it
-are drivers installed
-does the pc recognize the phone ?

So, I had already tried with Smartswitch, but it says device not supported and does not link at all.
Moreover yes, the computer could read the phone before the frp lock, and even now, odin can detect it in download mode.
Kies just loads for some minutes and then says "unable to link to the device"
EDIT: no sorry kies raises "the device does not respond"

ok we need to flash using odin , i assume you can't access recovery but if you tried and it worked, look at the top of the screen it must show a code like
<your A3 model> followed by <your country> followed by <frimware date>
If you couldnt, we can use an updated version for your model , please provide us with the model if u can.

I can only acces to odin mode. Via that, I have the following text:
Product name is: SM-A310F
Current binary: Custom (it was rooted)
System status: Custom
FRP LOCK: ON
Secure Download: Enabled
Knox Warranty Void: 1
RP SWREV: B:2 K:0 S:0
I am sure that the phone had Vodafone pre-installed applications, and looking at mrcrab.net there exist these possible stock firmware:
Android 5
Android 5
Android 6
Android 6
I only fear that if I mistaken the version I will obtain a wipe of my data, which are not vital but are important to me

Actually there is no way to avoid the reset as we don't know anything about the PDA version, install the drivers type in google "USB Samsung drivers"
It must show developer.Samsung.com/....
I'm on phone so I can't provide it as a link, install the drivers and try again, else we will get the latest version

I already have samsung usb drivers, and odin can succesfully detect the phone in download mode; Kies cannot, though
Anyway, if you open one of the links I posted, isn't the PDA shown in the line:
OS Version : A310FXXU1AOLE (chosen one as example)
In that website there is every stock firmware by model, android version, and mobile operator. I know two out of three, and those 4 links are the 4 possible choices regarding android version. If I picked the right one, would I avoid the data reset, wouldn't I?
EDIT: What, if I did how it is explained here with the latest version? I mean download android 6 last upgrade, extract it, rename .tar.md5 in .tar and flah it with odin? Would it be any risk of loosing data?

Hello,
.MD5 lets odin checksum the rom loaded to it to make sure it's not corrupted, however if you are sure of two main things:
that the frimware you are flashing isn't a downgrade as downgrading flashs a old bootloader which gets you in some kind of troubles possibly a brick, to avoid that, grab the latest version
and the second thing you must make sure of is that the file isn't anyway corrupted.
if you think it's all ok, then you can proceed as of i tried it once and it saved a device.

Okay, I'm sure now that my android version was 6.0.1 because I read that 5.1 didn't have single app permissions manager, and I definetely remember that I had it.
According to this page, I have three possible choices.
1) I think the right version is the oldest one. In case I mistaked, would I risk a brick even if the major version is the same?
2) Also, if I mistaked, do I risk a data loss even though the major version is the same?
Thank you (we're almost there)

Frank-95 said:
Okay, I'm sure now that my android version was 6.0.1 because I read that 5.1 didn't have single app permissions manager, and I definetely remember that I had it.
According to this page, I have three possible choices.
1) I think the right version is the oldest one. In case I mistaked, would I risk a brick even if the major version is the same?
2) Also, if I mistaked, do I risk a data loss even though the major version is the same?
Thank you (we're almost there)
Click to expand...
Click to collapse
The build number must be the same regarding the android version, so to keep the files it must be the same as the one in the phone, else a wipe will be performed.
The problem is that you want your data, that maybe lost if we don't have the exact same build.
Just grab the latest marshmallow or nougat -, but the data would be lost then.
Do a hard reset in case something went wrong.

I was able to unlock the phone a mantain the data! Thanks

I have a special problem with an old Samsung Galaxy A3 2016 SM-A310F (Android 7.0 Nougat)
on which the correct combined file cannot be obtained
I have tried perhaps all FRP removal options without success
A310FXXS5CSH3

Odin flash gets: Device:2 Binary:1

Hi Guys,
When trying to downgrade/flash below firmware via Odin I'm getting error:
SW REV. CHECK FAIL(BOOTLOADER) DEVICE: 2, BINARY: 1
Or if BL disabled following some recommendations:
KERNEL REV. CHECK FAIL. DEVICE:2, BINARY:1
Current version: (got via OTA)
G960FXXU2BRG6
Service provider OXM_XEF_00_0025 ... XEF/XEF, XEO/DBT - but this has probably nothing to do with that.
Returning to:
DBT-G960FXXU1BRE5
History of the phone is that I've received it on Saturday (manufactured on May 21), dual SIM + SD Card was working, got notification about OTA, and did proceed (silly me), got message that "no downgrade" will be possible - thought that it is for normal user, not the one with Odin magic, though have a feeling it has something to do with that. It was unusual message though thought it is something new on S(, but not really blocking me to downgrade with Odin.
Is there any way to downgrade? I really need to do that as thanks to Samsung I cannot use dual SIM + SD Card, described here:
https://forum.xda-developers.com/ga...o-sim-card-t3822368/post77193881#post77193881
Thanks!

When trying to downgrade/flash below firmware via Odin I'm getting error:
SW REV. CHECK FAIL(BOOTLOADER) DEVICE: 2, BINARY: 1
same problem, my S9 Plus is AFG cant intall only can update with DBT file but his current AFG no

Make sure you're using ODIN 3.13.x
You cannot downgrade the bootloader you can only flash firmware with an equal or higher BL version
G960FXXU2BRG6 <<< BL version 2
Check in Download mode what version yours says

*Detection* said:
Make sure you're using ODIN 3.13.x
You cannot downgrade the bootloader you can only flash firmware with an equal or higher BL version
G960FXXU2BRG6 <<< BL version 2
Check in Download mode what version yours says
Click to expand...
Click to collapse
Many thanks, that makes sense. I do remember message prior OTA apply "you won't be able to downgrade" but thought it was meaning that normal user won't be able to downgrade unless Odin would be used. Tough luck.
The worst part is that this is the first "U2" version for S9, so there's no path for me.
One more question - when "BL" was deselected and I've left only AP, CP, CSC - it resulted in message:
KERNEL REV. CHECK FAIL. DEVICE:2, BINARY:1
It is still in effort to downgrade the rest outside of BL, but does it seem I'm stuck on this firmware as the lowest on my phone now?
On technical side, these are all partitions on internal SDcard/memory. Why would it not be possible to overwrite it? Is it re-partitioning thing or something else? I'm trying to understand from where the limitation comes.
p.s. did some reading on bootloader process of Samsung and whilst it is clever and nice for Common Criteria, it should be possible to unlock it as in the past (Superboot tool). The good bootloader lecture is here: https://www.sciencedirect.com/science/article/pii/S1742287618300409 (S7 based).

Have you tried the patched Odin 13.3.1
https://www.google.com.au/amp/s/for...id/software/patched-odin-3-13-1-t3762572/amp/

batfink1 said:
Have you tried the patched Odin 13.3.1
https://www.google.com.au/amp/s/for...id/software/patched-odin-3-13-1-t3762572/amp/
Click to expand...
Click to collapse
What are risks using that Odin version and pushing AP?
Should I try to push BL too?
Apologies if I'm overly cautious it is that I don't want to brick the phone.

Honestly, I'm a take your balls in your hand kind of guy.
I'm a computer technician and if I spent all my time wringing my hands being cautious I'd never get anything done.
It's pretty hard to HARD BRICK these phones as long as you don't go faffing around with the partitions option in Odin.
God I've brought mine to the brink of death and back again.
Just out of curiosity, do you have a way of taking a photo of your Odin/Download mode screen... I'll try to post mine.
I'm rooted and running a customised stock based rom on BRE5

My Odin screen

batfink1 said:
Honestly, I'm a take your balls in your hand kind of guy.
I'm a computer technician and if I spent all my time wringing my hands being cautious I'd never get anything done.
It's pretty hard to HARD BRICK these phones as long as you don't go faffing around with the partitions option in Odin.
God I've brought mine to the brink of death and back again.
Just out of curiosity, do you have a way of taking a photo of your Odin/Download mode screen... I'll try to post mine.
I'm rooted and running a customised stock based rom on BRE5
Click to expand...
Click to collapse
Well... sometimes it is better to be safe than sorry... (at least this is my take), like with that unfortunate upgrade.
If you're that brave, why don't you upgrade to the latest one and then try to downgrade?
Attached is Download mode screenshot.

batfink1 said:
My Odin screen
Click to expand...
Click to collapse
Interestingly, your model shows 6GB, mine 4GB, but it doesn't matter...
Thanks... I'll debating if to give it a shot with that custom Odin version. Did you try it? Should BL be included?

I said brave, not freaking insane... Mine is rooted and working perfectly
I honestly DON'T want to go through the 17 days of possibly having to wait for the RMM STATE again haha
---------- Post added at 06:25 PM ---------- Previous post was at 06:21 PM ----------
Mines an S9+, they have 6 gig compared to the S9 which only has 4 gig.
I didn't try it, no.. I just know the modded version exists.

I'm having the same problem
Hi guys I'm having the same problem with kernel rev check fail.
I had a brand firmware and tried to make it no-brand, but something went wrong.
Now when trying to flash a no-brand firmware, Odin stops during system.img
What can I do? Do I have to reinstall the same branded old firmware that I had?
Thanks!

Ma5terDevil said:
Hi guys I'm having the same problem with kernel rev check fail.
I had a brand firmware and tried to make it no-brand, but something went wrong.
Now when trying to flash a no-brand firmware, Odin stops during system.img
What can I do? Do I have to reinstall the same branded old firmware that I had?
Thanks!
Click to expand...
Click to collapse
Just a thought - your non-brand might be of an older release than branded software. In worst case you're stuck on working branded soft?

i tried, i doesn't work either with/without BL
batfink1 said:
Have you tried the patched Odin 13.3.1
https://www.google.com.au/amp/s/for...id/software/patched-odin-3-13-1-t3762572/amp/
Click to expand...
Click to collapse
i tried, i doesn't work either with/without BL selected. so i guess the modified odin did not fit for the new firmware.

I Tried
Me too being the grab your balls by the hand person that likes to boldly go where no man has gone before, attempted the patch version of Odin on my s9 in an attempt to put the TMO firmware on to get RCS chat. Using BL AP CL and CSC all did not work. I got the same stupid message regarding the downgrade. I then tried AP and CSC alone. Same issue. Finally, I tried just CSC. It gave a similar error but it was difference in the sense that it says [cache]fused 2 > Binary 1.
It's super annoying that you can't move from u1 to u (unlocked to carrier) without having to do all this crap.

Hey all, dunno if you resolved the kernel error but I was getting the same thing on my S8 (SM-G950F) and ended up checking if anyone at the Samsung store could fix it (they could). Have a look at this post I wrote up, hopefully it's somewhat useful.
https://forum.xda-developers.com/showpost.php?p=77580177&postcount=18

Same problem I got. No matter if I use modded or normal ODIN... Even if I do not flash Boot, I got the message Kernel Rev. check fail...
To me, this is almost criminal from Samsung... I pay 800 Euro for the phone and I like to run a different system. I think there is no law against using a Computer (which in fact it is) with an Operating system of my choice.
To me, a restriction of "liberty".

joe535 said:
Same problem I got. No matter if I use modded or normal ODIN... Even if I do not flash Boot, I got the message Kernel Rev. check fail...
To me, this is almost criminal from Samsung... I pay 800 Euro for the phone and I like to run a different system. I think there is no law against using a Computer (which in fact it is) with an Operating system of my choice.
To me, a restriction of "liberty".
Click to expand...
Click to collapse
ODIN is a Samsung INTERNAL tool, you're not even meant to be using it
And you do have the freedom to run whatever OS you want, you have that choice the day you choose to buy a new phone, otherwise read the smallprint, pretty sure you agreed to Samsungs terms when you bought the phone
I don't get why people buy Samsung phones knowing how locked down they can be, knowing they don't run vanilla Android, knowing about KNOX, and then complain when they can't do anything with them.... if I wanted to mod my phone without any problems I wouldn't be buying Samsung

Anyway, honestly I accidentally updated my spare S9 to U2 forgetting it can't be rolled back and I had a little bit of trouble finding a firmware that ran fine with gravity box, but now I'm running a custom BRI3 rooted with magisk running gravity box where 99% of features work including lock screen security.
So unless the U2 bootloader is effecting you in some way... Does it matter if you can't roll back.

Well, the hardware of Samsung I actually do like.. But the software policy I do not.
For sure, never again I will buy Samsung

Can I downgrade to One UI 2.5 from 3.0?

Hello guys I'm a s20+ user model SM G985F. I used to use nova launcher and good luck module task changer with one ui 2.5.
However after upgrading to one ui 3.0 good luck doesn't work any more. Nova launcher is pretty much usable as well as the recent apps menu is too much buggy working with 3rd party launchers.
I find the default Samsung home launcher just unbearable and horrible to look at. So I want to downgrade back to One UI 2.5, as good lock won't be supported on One UI 3 until February 2021.
Is it possible to flash one ui 2.5 rom via after upgrading to one ui 3.0? Any advice on this topic would be greatly appreciated. TIA.

nealzXincredible said:
Hello guys I'm a s20+ user model SM G985F. I used to use nova launcher and good luck module task changer with one ui 2.5.
However after upgrading to one ui 3.0 good luck doesn't work any more. Nova launcher is pretty much usable as well as the recent apps menu is too much buggy working with 3rd party launchers.
I find the default Samsung home launcher just unbearable and horrible to look at. So I want to downgrade back to One UI 2.5, as good lock won't be supported on One UI 3 until February 2021.
Is it possible to flash one ui 2.5 rom via after upgrading to one ui 3.0? Any advice on this topic would be greatly appreciated. TIA.
Click to expand...
Click to collapse
Hi there. Yes you can go back to firmware with OneUI2.5 default but you will have to factory reset the device. Also make sure the firmware you are flashing via Odin has the same boot loader version you are currently on or you will not be able to downgrade. I am not a S20 user but the process should be the same as on my Note 10+.
Going down in firmware versions always factory wipes the device and is also not possible if the older firmware is not on the same boot-loader version. Hope this help you.

Evil_Smiley_za said:
Hi there. Yes you can go back to firmware with OneUI2.5 default but you will have to factory reset the device. Also make sure the firmware you are flashing via Odin has the same boot loader version you are currently on or you will not be able to downgrade. I am not a S20 user but the process should be the same as on my Note 10+.
Going down in firmware versions always factory wipes the device and is also not possible if the older firmware is not on the same boot-loader version. Hope this help you.
Click to expand...
Click to collapse
Hi thanks so much for the response. I don't mind if my device gets factory reset. I'm currently on the Indian firmware One ui 3.0. If I flash the same Indian firmware one ui 2.5 then everything should be fine right?

nealzXincredible said:
Hi thanks so much for the response. I don't mind if my device gets factory reset. I'm currently on the Indian firmware One ui 3.0. If I flash the same Indian firmware one ui 2.5 then everything should be fine right?
Click to expand...
Click to collapse
Yes it should. Except for the factory wipe. Make sure of the boot loader.....

Hi there,
- Goodluck is working fine for me on Ui 3 (no root), what feature is not working for you ?
- I'm interested to know if you downgrade successfuly yet because I tried everything too, but I failed to go back to BTJ3 from CTKF (and I would be happy to return to ui2.5 just because I destroyed a Samsung Cloud backup by mistake ... and I have a TWRP backup there)

ric69 said:
Hi there,
- Goodluck is working fine for me on Ui 3 (no root), what feature is not working for you ?
- I'm interested to know if you downgrade successfuly yet because I tried everything too, but I failed to go back to BTJ3 from CTKF (and I would be happy to return to ui2.5 just because I destroyed a Samsung Cloud backup by mistake ... and I have a TWRP backup there)
Click to expand...
Click to collapse
Heard other saying Good Lock wasn't working after going to 3.0; might be a regional or variant related issue.
This won't help this time but for the future get a large, fast sd card to use as a data drive. A Lexar V30 500gb card can be had for about $75.
Keep all essential data there rather than internal memory. This how I set up all my PCs and now the 10+. Make use of this and the added redundancy it can bring to your phone.
I have a copy of all my apps and updates loaded there too (Apk Export). The card data is then also backed up to the PC.
Keep the downloads folder on the internal memory until files are deemed safe; an extra layer of malware insulation. This has saved me once already from an infected jpeg.
Backup settings of apps that permit it.
I can do a full reload with little or no internet and be running again in about 2 hours with all my files, music, photos, etc loaded and ready to go.
Make full use of your SD card slot...
I'm holding a fast 1 tb dual drive PC in my hand, outstanding.

Hi there, i rollback from OneUi 3.0 to 2.5 with no problems, you just have to make sure that the binary and the bootloader are the same and you are ready to go

nealzXincredible said:
Hello guys I'm a s20+ user model SM G985F. I used to use nova launcher and good luck module task changer with one ui 2.5.
However after upgrading to one ui 3.0 good luck doesn't work any more. Nova launcher is pretty much usable as well as the recent apps menu is too much buggy working with 3rd party launchers.
I find the default Samsung home launcher just unbearable and horrible to look at. So I want to downgrade back to One UI 2.5, as good lock won't be supported on One UI 3 until February 2021.
Is it possible to flash one ui 2.5 rom via after upgrading to one ui 3.0? Any advice on this topic would be greatly appreciated. TIA.
Click to expand...
Click to collapse
ric69 said:
Hi there,
- Goodluck is working fine for me on Ui 3 (no root), what feature is not working for you ?
- I'm interested to know if you downgrade successfuly yet because I tried everything too, but I failed to go back to BTJ3 from CTKF (and I would be happy to return to ui2.5 just because I destroyed a Samsung Cloud backup by mistake ... and I have a TWRP backup there)
Click to expand...
Click to collapse
were you guys able to downgrade successfully?

Guys follow the below guide
1. switch off your phone
2. connect USB cable to the PC
3. Press and hold volume up and volume down keys at the same time
4. Connect USB cable to your phone
5. it will take you to the download mode screen
Then you can downgrade it to the version you like. The downgrade build should be on bootloader v5

saif.dmaster said:
Guys follow the below guide
1. switch off your phone
2. connect USB cable to the PC
3. Press and hold volume up and volume down keys at the same time
4. Connect USB cable to your phone
5. it will take you to the download mode screen
Then you can downgrade it to the version you like. The downgrade build should be on bootloader v5
Click to expand...
Click to collapse
without factory reset?

Hey Evil_Smiley_za, you mentioned a couple times to make sure bootloader is the same. Do you know how to check that? I too wants to downgrade my 3.0 to 2.5. I found the FW on sammobile but not sure if bootloader are the same
Download Samsung Galaxy S20+ SM-G986U VZW USA (Verizon) firmware
All Samsung firmwares for Galaxy S20+ in USA (Verizon) with model code SM-G986U. We offer free and fast download options. Check them out now.
www.sammobile.com
Any advice?

andrep18201 said:
Hey Evil_Smiley_za, you mentioned a couple times to make sure bootloader is the same. Do you know how to check that? I too wants to downgrade my 3.0 to 2.5. I found the FW on sammobile but not sure if bootloader are the same
Download Samsung Galaxy S20+ SM-G986U VZW USA (Verizon) firmware
All Samsung firmwares for Galaxy S20+ in USA (Verizon) with model code SM-G986U. We offer free and fast download options. Check them out now.
www.sammobile.com
Any advice?
Click to expand...
Click to collapse
Go to https://samfw.com/ and find your device. Look for your firmware version, and note the "Bit" collumn. Find an earlier ROM you'd like to flash, ensuring that the "Bit" is the same for both.

X04D said:
Go to https://samfw.com/ and find your device. Look for your firmware version, and note the "Bit" collumn. Find an earlier ROM you'd like to flash, ensuring that the "Bit" is the same for both.
Click to expand...
Click to collapse
Everything seems to have Bit '1' for my device SM-G986U. Thanks, I'll give it a go

TeeKay35 said:
without factory reset?
Click to expand...
Click to collapse
Hi
Did you try this method? Was it with or without factory reset?

golemka said:
Hi
Did you try this method? Was it with or without factory reset?
Click to expand...
Click to collapse
No i didnt try it

Is it possible to keep all of data, doing the downgrade from 3.0 to 2.5 without factory reset?

I doubt you will keep the data. It gonna wipe everything

is it possible to downgrade from 3.1 to 2.5??

konoplya said:
is it possible to downgrade from 3.1 to 2.5??
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If the factory load version is 2.5 you can easily do it. Otherwise I think it's firmware reflash time...

blackhawk said:
If the factory load version is 2.5 you can easily do it. Otherwise I think it's firmware reflash time...
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i sent in my phone to samsung for warranty work and they upgraded it to 3.1. when i factory reset it resets to 3.1. how can i flash it to 2.5? and thank you