[Downgrade][S-ON] Downgrade by flashing older version of official RUU

[handsome_hell]

Get the method from here:
https://bbs.htc.com/cn/thread-109059-1-1.html

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This method seems to modify the original system version number so that the old version of the RUU file can pass the checking.

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Backup your data before downgrading.
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1. Download the RUU file which is the version you need.
2. Reboot to download mode, then flash the TWRP via fastboot.
Unofficial TWRP for U11+: https://forum.xda-developers.com/htc-u11/development/unofficial-htc-u11-twrp-recovery-t3706264
Fastboot command:

fastboot flash recovery recovery.img

3. Reboot to recovery mode, then get sde1 file by :

adb pull /dev/block/sde1

4. Open the file with a text editor and change the version number, which is easy to found, to the version number of your RUU file.
5. Push back the file by

adb push sde1 /dev/block

If it shows "does not have enough space", delete the original file by the files manager in the recovery first.
6. Flash your RUU file by entering into the download mode after copying it to the SD card.

Tested on U11+ China version, no problems found.

Hope this can help you.

 

[neofrost37]

Get the method from here:
https://bbs.htc.com/cn/thread-109059-1-1.html

----------

This method seems to modify the original system version number so that the old version of the RUU file can pass the checking.

--------------------
Backup your data before downgrading.
--------------------

1. Download the RUU file which is the version you need.
2. Reboot to download mode, then flash the TWRP via fastboot.
Unofficial TWRP for U11+: https://forum.xda-developers.com/htc-u11/development/unofficial-htc-u11-twrp-recovery-t3706264
Fastboot command:
fastboot flash recovery recovery.img
3. Reboot to recovery mode, then get sde1 file by :
adb pull /dev/block/sde1
4. Open the file with a text editor and change the version number, which is easy to found, to the version number of your RUU file.
5. Push back the file by
adb push sde1 /dev/block
If it shows "does not have enough space", delete the original file by the files manager in the recovery first.
6. Flash your RUU file by entering into the download mode after copying it to the SD card.

Tested on U11+ China version, no problems found.

Hope this can help you.

Wow great news mate. i'll try now and post results. Thank's !!!

 

[sotong]

Great, it works! I downgraded to India_SEA 1.10.400.23 and now updating via OTA to 1.24.400.4 (as what i was looking for). Thanks a lot!

 

[neofrost37]

Great, it works! I downgraded to India_SEA 1.10.400.23 and now updating via OTA to 1.24.400.4 (as what i was looking for). Thanks a lot!

Hi mate, one question...to get OTA Updates i need relock bootloader and get stock recovery ?. Thank's

 

[handsome_hell]

Hi mate, one question...to get OTA Updates i need relock bootloader and get stock recovery ?. Thank's

You don't need to relock bootloader, but you have to get stock recovery.

 

[sotong]

Hi mate, one question...to get OTA Updates i need relock bootloader and get stock recovery ?. Thank's

Yup, as OP stated, you only need the stock recovery. I relocked my bootloader anyway though

 

[lohimami]

can u post software download link?

 

[handsome_hell]

can u post software download link?

You can look for it here:
https://forum.xda-developers.com/htc-u11/how-to/stock-recovery-taiwan-version-1-10-709-t3719599
or:
https://androidfilehost.com/?w=search&s=2Q4DIMG

 

[lohimami]

You can look for it here:
https://forum.xda-developers.com/htc-u11/how-to/stock-recovery-taiwan-version-1-10-709-t3719599
or:
https://androidfilehost.com/?w=search&s=2Q4DIMG

Thanks 4 ur help. But i want to download these file as below:

https://drive.google.com/file/d/18Fj2gHuw4TeM39oR--uhsC2OUDXn4hlm/view?usp=sharing

 

[handsome_hell]

Thanks 4 ur help. But i want to download these file as below:

https://drive.google.com/file/d/18Fj2gHuw4TeM39oR--uhsC2OUDXn4hlm/view?usp=sharing

I don't have ADB tools for Windows...
Maybe you can try this:
https://www.google.co.id/amp/s/www.xda-developers.com/install-adb-windows-macos-linux/amp/

 

[lohimami]

Tested. Ok on HTC__621 taiwan device.

 

[schranzl]

Thanks for the guide. Does it work if you swiped to "allow system modification" in twrp?

 

[newyesor]

HTC U11 Plus is base on android oreo.
I think you can flash ruu normally.
You can flash older version of RUU follow software number and it's same version android.
If you want to rollback from new version android ,this method is important.
Ex RUU 1.xx.400.x Android 8.0
Your devices is software number 1.24.400.x ,Android 8.0
You can use Ruu above for flash your device.

 

[handsome_hell]

Thanks for the guide. Does it work if you swiped to "allow system modification" in twrp?

Of course, why I would find this method is to restore the modified system partition.

 

[sardroid]

Deleted

 

[Ba Duc]

Great, it works! I downgraded to India_SEA 1.10.400.23 and now updating via OTA to 1.24.400.4 (as what i was looking for). Thanks a lot!

hi Sotong rom India_SEA 1.10.400.23 for what is CID?

 

[edkmho]

Hey Guys, would this procedure work if i would like to return the phone to stock with custom rom??

By the way, is it possible to pull the sde1 without flashing the trwp recovery image?
I have tried to pull the file with the following steps and it is a success but not sure if the file is okay:
adb root
adb pull /dev/block/sde1

I can see the version number in the file with notepad++

Please advise. thanks.

 

[edkmho]

Yup, as OP stated, you only need the stock recovery. I relocked my bootloader anyway though

How do you relock your bootloader???

I managed to flash to stock but the bootloader remain unlock.

Please help.

 

[edkmho]

Hi all,

Managed to get reload the stock rom and re-lock the bootloader.

Thanks.

 

[q3ahmd]

Do I need TWRP and SD card?

Can I just use fastoot/adb and flash from PC directly?

Also what images are needed? I only have boot system and recovery stock images. Is that good enough?