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[How-To][Tutorial] Downgrade Kit Kat 4.4.2 to JB 4.1.2

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By alidsd, Senior Member on 17th June 2014, 06:50 PM
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Hi,
I am just writing these steps to help those who want to downgrade from KK to JB due to any reason. Please use these steps at your own risk.

Some Background:
Recently I updated my Razr M to KK, it was Locked and Unrooted, but with the help of Twelroot and Motopocalypse I rooted and unlocked the BL.
Now somehow I didn't like the KK and wanted to go back to JB 4.1.2 because I was now having unlocked BL and rooted phone so it was easy but need to follow some steps to successfully downgrade to JB. So an unlocked BL and rooted with KK is must.

Prerequisite:
USB drivers for Razr M must be installed before proceeding.

Steps:

1. download the firmware file [Android 4.1.2
Blur_Version.98.30.1.XT907.Verizon.en.US
] from http://sbf.droid-developers.org/phone.php?device=8

2. extract the above archive and replace the XML file with the one in attachment.

3. put the phone into fastboot mode and flash the firmware with RSD Lite (attached)

4. reboot and now you have JB 4.1.2

If you want to install root application again and also want to flash custom recovery then please follow the Post#5 [ATTACK] (thanks ATTACK)


Note : for custom recovery you will need the fastboot.exe if you don't have it then install minimal_adb_fastboot_v1.1.3_setup.exe(attached).
Put the phone in fastboot mode, copy the recovery to c:\ and execute the below command :
fastboot flash recovery [Path to recovery image]

If it help you then don't forget to press Thanks button !
Attached Files
File Type: zip downgrade.zip - [Click for QR Code] (16.03 MB, 29352 views)
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17th June 2014, 08:44 PM |#2  
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Forgive my ignorance but this won't downgrade the kernel will it? I'm hoping it's possible to go from the newest OTA to the stable CM11 but I'm guessing this is new kernel JB. Either way thanks if I can't go to stable CM11 I'll stick with rooted 4.1.2.
18th June 2014, 07:02 AM |#3  
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Once you have a unlocked bootloader, you do not need to use "root programs". All you need to do is flash a custom recovery via Mfastboot / fastboot then flash SuperSU / Superuser.

In dhacker29's folder there are 2 different recoveries.
  • "msm8960" is for 4.1.2
  • "KITKAT" is for 4.4.2
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18th June 2014, 11:13 AM |#4  
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Quote:
Originally Posted by ATTACK

Once you have a unlocked bootloader, you do not need to use "root programs". All you need to do is flash a custom recovery via Mfastboot / fastboot then flash SuperSU / Superuser.

In dhacker29's folder there are 2 different recoveries.

  • "msm8960" is for 4.1.2
  • "KITKAT" is for 4.4.2

thanks ATTACK, can you please point out that which recovery is specially for 4.1.2 because there are a lot of recoveries with msm8960 in Dhacker29's folder.
One more thing if you have flashable Su and busybox zip then please attach it , i will update the OP.

thanks alot.
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18th June 2014, 03:28 PM |#5  
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DHACKER29's FOLDER
- LINK

JELLYBEAN 4.1.2 RECOVERIES
- CWM-6.0.4.6-swipe-moto_msm8960
- TWRP-2.7.0.0-moto_msm8960-hdpi


KITKAT 4.4.2 RECOVERIES
- CWM6049-RAZR-HD_M-KITKAT
- TWRP2710-RAZR_M-KITKAT


SUPERUSER - I'm just going to link to Chainfire's thread, Direct people to download from there.
http://forum.xda-developers.com/show....php?t=1538053

BUSYBOX
https://play.google.com/store/apps/d...busyboxonrails
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18th June 2014, 09:44 PM |#6  
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Could you go back to KK when you've downgraded to JB? Just asking this question early before the CM11 M8 release and the transition occurs.
18th June 2014, 09:53 PM |#7  
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Quote:
Originally Posted by TheForceUnleashed

Could you go back to KK when you've downgraded to JB? Just asking this question early before the CM11 M8 release and the transition occurs.

Yes.
18th June 2014, 10:23 PM |#8  
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Quote:
Originally Posted by ATTACK

Yes.

So just by flashing the KK firmware in RSD without any changes to the xml? Sorry for the noob questions, I realize how easy this phone can be bricked and I want to avoid it.
18th June 2014, 10:32 PM |#9  
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Quote:
Originally Posted by TheForceUnleashed

So just by flashing the KK firmware in RSD without any changes to the xml? Sorry for the noob questions, I realize how easy this phone can be bricked and I want to avoid it.

I see don't why you would need to. It would be just like restoring stock firmware via RSD Lite.
18th June 2014, 11:20 PM |#10  
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When I try to flash this, I get Failure on 2/20, sbl1
19th June 2014, 12:24 AM |#11  
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Quote:
Originally Posted by jrk190

When I try to flash this, I get Failure on 2/20, sbl1

Did you replace the XML file included in attachment?

Sent from my ME173X using Tapatalk
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