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[GUIDE]Downgrade the undowngradeable phones

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By berni987654321, Recognized Contributor on 8th December 2012, 10:14 PM
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Hi guys,

I'm very prowed to say that I succesfully downgraded my phone.

I nearly tried everything and nothing worked, always blackscreen
when booting with the old gb bootloader.

The probleme is that some p920s need a special
x-loader and u-boot file which nobody backed up. I just
got them and now restoring to gb will work for everyone.

Use this files too if you've downgraded from su760 ics port
and your having problems with network.

How to make your phone work on gb again:

1. Download this and extract:
mmcblk0p1-4

2. flash complere bootv21e when you are on ics

3. then go into fastboot mode with wkparks omap tool

4. open cmd and go into the directory with the downloaded files

5. type:
fastboot flash u-boot u-boot.img
fastboot flash x-loader x-loader.img
fastboot reboot

6. fix your imei

hope it works for you for me worked nothing else
Last edited by berni987654321; 14th March 2013 at 08:19 PM.
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8th December 2012, 11:58 PM |#2  
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WOW its working Thank u very much
9th December 2012, 12:09 AM |#3  
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Quote:
Originally Posted by menasamir

WOW its working Thank u very much

no problem
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9th December 2012, 12:25 AM |#4  
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Quote:
Originally Posted by berni987654321

Hi guys,

I'm very prowed to say that I succesfully downgraded my phone.

I nearly tried everything and nothing worked, always blackscreen
with booting with the old gb bootloader.

Half a hour I read xbsals post the one whiches phones don't boot
after flashing the gb bootloaders would need a special bin which nobody has
because nobody made a backup. But then I remembered my post in samnos thread about downgrading from wrong flashed ics leaks with my first 4 partitions attached.

Do how to make your phone work on gb again:

1. Download this and extract:
mmcblk0p1-4

2. flash complere bootv21e when you are on ics

3. then go into fastboot mode with wkparts omap tool

4. open cmd and go into the directory with the downloaded files

5. type fastboot flash u-boot u-boot.img
fastboot flash x-loader x-loader.img
fastboot flash nv1 nv1.img
fastboot flash nv2 nv2.img
fastboot reboot

6. fix your imei

hope it works for you for me worked nothing else

berni987654321 I have to thank you I have been using your u-boot.img and x-loader.imgfor a number of weeks it's helped me out on numerous occasions btw I have flashed only u-boot.img and x-loader.img and not nv1 and nv2 and not had to restore IMEI.

using this -P920 Backup Of mmcblk0p1-4 - http://forum.xda-developers.com/atta...8&d=1347623892 (Thanks berni)

This is how I fixed my downgrade problems thanks to you http://forum.xda-developers.com/show...&postcount=909
Last edited by kidkoala_uk; 9th December 2012 at 12:49 AM.
9th December 2012, 12:53 AM |#5  
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i'm very happy too that I uploaded the files elseway I would be self stucked on ics
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9th December 2012, 01:15 AM |#6  
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Quote:
Originally Posted by berni987654321

i'm very happy too that I uploaded the files elseway I would be self stucked on ics

Likewise mate I stumbled across it after xbsall bootv21e did not work for me then I remembered samno's partition test which in turn led me to your files, I'm so grateful you backed these up.

---------- Post added at 01:15 AM ---------- Previous post was at 12:59 AM ----------

have you managed to get CM10 booting yet?
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9th December 2012, 01:26 AM |#7  
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Quote:
Originally Posted by kidkoala_uk

Likewise mate I stumbled across it after xbsall bootv21e did not work for me then I remembered samno's partition test which in turn led me to your files, I'm so grateful you backed these up.

---------- Post added at 01:15 AM ---------- Previous post was at 12:59 AM ----------

have you managed to get CM10 booting yet?

no I flashed bootv21e my backup files and then 21a kdz but it doesn't boot yet, I'm now playing around with my gpt table cause I have probs with internal memory and mounting some partitions in recovery
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9th December 2012, 01:28 AM |#8  
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Quote:
Originally Posted by berni987654321

no I flashed bootv21e my backup files and then 21a kdz but it doesn't boot yet, I'm now playing around with my gpt table cause I have probs with internal memory and mounting some partitions in recovery

I had the same problem with internal memory, Booted into recovery and factoryreset/data/nvram wipe fixed it for me.
Last edited by kidkoala_uk; 9th December 2012 at 01:32 AM.
9th December 2012, 01:33 AM |#9  
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Thank you berni987654321
It works!

Now I'm sticking to GB until CM10 gets stable.
9th December 2012, 01:38 AM |#10  
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Should be a sticky imo given the amount of users unable to downgrade from ICS.
9th December 2012, 01:44 AM |#11  
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Quote:
Originally Posted by berni987654321

no I flashed bootv21e my backup files and then 21a kdz but it doesn't boot yet, I'm now playing around with my gpt table cause I have probs with internal memory and mounting some partitions in recovery

is the problem you having has to do with your sdcard reading as damage when switch back to ginerbread from ics?

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