FORUMS
Remove All Ads from XDA

[Q] How to restore DROID RAZR M back to stock JB 4.1.2 from the kitkat 4.4.2

30 posts
Thanks Meter: 0
 
By kulsforu, Member on 21st May 2014, 07:25 AM
Post Reply Email Thread
Can any one help me to restore my XT907 back to stock JB 4.1.2 from the stock kitkat 4.4.2 update?
My current System version is: 183.46.10.XT907.Veryzon.en.US
Android Version: 4.4.2
Baseband Version: SM_BP_101031.042.32.86P
Kernal Version: 3.4.42-g5170b6b
[email protected] #1
Fri May 2 00:30:06 PDT 2014
Build Number: KDA20.62-10.1
Build Date: Fri May 2 00:20:25 PDT 2014

Please help me.. Thanks in advance...
 
 
21st May 2014, 01:09 PM |#2  
Leraeniesh's Avatar
Senior Member
Flag Detroit
Thanks Meter: 985
 
Donate to Me
More
Wouldn't recommend you try it on a locked bootloader.
Those that are unlocked shouldn't have any issues.
21st May 2014, 02:57 PM |#3  
Senior Member
Thanks Meter: 151
 
More
Technically, with a locked bootloader, if Fastboot will allow you to downgrade, then it should be possible.
You'd have to boot into Fastboot, then run the command:

fastboot flash system system.img

Where system.img is the 4.1.2 image file extracted from the fxz file. If it won't let you do this, then downgrade isn't possible. It will likely say failed flash and you'll have to flash something to kick the phone out of fastboot like logo.img.

You could also try RSDLite and try to flash the 4.1.2 fxz, but I doubt that will work because bootloader and such are not downgradeable and it will likely fail.
22nd May 2014, 07:54 AM |#4  
OP Member
Thanks Meter: 0
 
More
Quote:
Originally Posted by GnatGoSplat

Technically, with a locked bootloader, if Fastboot will allow you to downgrade, then it should be possible.
You'd have to boot into Fastboot, then run the command:

fastboot flash system system.img

Where system.img is the 4.1.2 image file extracted from the fxz file. If it won't let you do this, then downgrade isn't possible. It will likely say failed flash and you'll have to flash something to kick the phone out of fastboot like logo.img.

You could also try RSDLite and try to flash the 4.1.2 fxz, but I doubt that will work because bootloader and such are not downgradeable and it will likely fail.


Thanks for ur reply..
My bootloader is locked. I want to try downgrade to stock 4.1.2. Can u please send me the link to download stock 4.1.2 img and exact steps to downgrade?

Thnaks so much in advance..
22nd May 2014, 02:25 PM |#5  
Senior Member
Thanks Meter: 151
 
More
Quote:
Originally Posted by kulsforu

Thanks for ur reply..
My bootloader is locked. I want to try downgrade to stock 4.1.2. Can u please send me the link to download stock 4.1.2 img and exact steps to downgrade?

Thnaks so much in advance..

You can get them here:
http://sbf.droid-developers.org/phone.php?device=8
You can extract the original system.img from the archive as well as logo.img in case the phone doesn't allow you to flash system.img, you can use logo.img to kick the phone out of Fastboot. You will need to install Motorola ADB drivers on your computer in advance, and also need a fastboot.exe file which I think you can find via Google, but if you have ever rooted your phone in the past, usually that also came with fastboot.

Anyway, get into fastboot mode by turning off the phone, then holding down all 3 buttons. Use vol- to select Fastboot and vol+ to choose it. Phone should boot into fastboot.

Connect to PC and issue command:
fastboot flash system system.img

If it works, the phone should be downgraded. If it says flash failed, then downgrade isn't possible. In that case, if the phone is stuck in fastboot mode and can't be rebooted, issue this command to get out of fastboot.
fastboot flash logo logo.img

That should let it reboot as normal.

I actually doubt it's possible to downgrade, but I haven't tried it myself so I can't say for sure.
23rd May 2014, 06:07 AM |#6  
OP Member
Thanks Meter: 0
 
More
Quote:
Originally Posted by GnatGoSplat

You can get them here:
http://sbf.droid-developers.org/phone.php?device=8
You can extract the original system.img from the archive as well as logo.img in case the phone doesn't allow you to flash system.img, you can use logo.img to kick the phone out of Fastboot. You will need to install Motorola ADB drivers on your computer in advance, and also need a fastboot.exe file which I think you can find via Google, but if you have ever rooted your phone in the past, usually that also came with fastboot.

Anyway, get into fastboot mode by turning off the phone, then holding down all 3 buttons. Use vol- to select Fastboot and vol+ to choose it. Phone should boot into fastboot.

Connect to PC and issue command:
fastboot flash system system.img

If it works, the phone should be downgraded. If it says flash failed, then downgrade isn't possible. In that case, if the phone is stuck in fastboot mode and can't be rebooted, issue this command to get out of fastboot.
fastboot flash logo logo.img

That should let it reboot as normal.

I actually doubt it's possible to downgrade, but I haven't tried it myself so I can't say for sure.


Thank u so much my friend, I need to clear that I m using this phone in India with Reliance CDMA network. If downgrade will succeed then will it in verizon locked condition or it will remain unlocked for global use? Also I need to add that I have never unlocked my bootloader or rooted my phone.
23rd May 2014, 01:42 PM |#7  
Senior Member
Thanks Meter: 151
 
More
Quote:
Originally Posted by kulsforu

Thank u so much my friend, I need to clear that I m using this phone in India with Reliance CDMA network. If downgrade will succeed then will it in verizon locked condition or it will remain unlocked for global use? Also I need to add that I have never unlocked my bootloader or rooted my phone.

I think it would stay unlocked since you wouldn't be reflashing the radio.
It is easy enough to re-unlock if that should get reversed, however.
23rd May 2014, 02:59 PM |#8  
Senior Member
Thanks Meter: 151
 
More
Ah, nevermind. Don't bother to try it. Even if you could succeed, you'd end up with black screen after the logo. The newer bootloaders will not allow Jellybean to boot. There is no way to downgrade. KitKat is a one way road with a locked BL. Sorry!
24th May 2014, 08:48 AM |#9  
OP Member
Thanks Meter: 0
 
More
Quote:
Originally Posted by GnatGoSplat

Ah, nevermind. Don't bother to try it. Even if you could succeed, you'd end up with black screen after the logo. The newer bootloaders will not allow Jellybean to boot. There is no way to downgrade. KitKat is a one way road with a locked BL. Sorry!


24th May 2014, 05:33 PM |#10  
Senior Member
Thanks Meter: 151
 
More
Sorry for the bad news. I'm in the same boat now too. Thought I would experiment with ways to preserve root, and long story short, now I'm stuck on an unrooted phone on stock KK with locked BL.

Why do you want to downgrade? If it's to be rooted, sorry, no solution for that. If there is some other issue, maybe there is a solution for that specific issue.
26th May 2014, 07:19 AM |#11  
OP Member
Thanks Meter: 0
 
More
Quote:
Originally Posted by GnatGoSplat

Sorry for the bad news. I'm in the same boat now too. Thought I would experiment with ways to preserve root, and long story short, now I'm stuck on an unrooted phone on stock KK with locked BL.

Why do you want to downgrade? If it's to be rooted, sorry, no solution for that. If there is some other issue, maybe there is a solution for that specific issue.

The issue is my CDMA data is not working after upgrade to kitkat. I m from India and using Reliance CDMA sim. Before update, everything was working perfect. But now only data(EVDO or 1x) is not working. GSM data(3G & 2G) is working.
Please help if u have any solution for this issue.
Post Reply Subscribe to Thread

Guest Quick Reply (no urls or BBcode)
Message:
Previous Thread Next Thread
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes