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[Q]Can't downgrade via RUU

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chuaniyang
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(Last edited by chuaniyang; 24th December 2013 at 08:25 AM.) Reason: correct error spelling
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Question [Q]Can't downgrade via RUU

My device is M7_U , TAIWAN version,
S-OFF, and unlock, CID is HTC__621

and i have a RUU exe file with version 1.20.709.101.

I'm try to downgrage to 1.20 after OTA and always successed before rom version 3.63. like

OTA to 2.24, and downgrage to 1.20 -> work fine.
OTA to 3.18, and downgrage to 1.20 -> work fine.

but currently, I just OTA to 3.63 and trying to downgrade back to 1.20.

RUU always show error image and stop.

is firmware 3.63 doing something different then before version ?

I checked the firmware 3.63 content, there is one file added "tp_HMX852XD.img"

what is this file working ? is it make my device can't downgrade to before version ?
 
nkk71
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Quote:
Originally Posted by chuaniyang View Post
My device is M7_U , TAIWAN version,
S-OFF, and unlock, CID is HTC__621

and i have a RUU exe file with version 1.20.709.101.

I'm try to downgrage to 1.20 after OTA and always successed before rom version 3.63. like

OTA to 2.24, and downgrage to 1.20 -> work fine.
OTA to 3.18, and downgrage to 1.20 -> work fine.

but currently, I just OTA to 3.63 and trying to downgrade back to 1.20.

RUU always show error image and stop.

is firmware 3.63 doing something different then before version ?

I checked the firmware 3.63 content, there is one file added "tp_HMX852XD.img"

what is this file working ? is it make my device can't downgrade to before version ?
1- the "tp_" file is for updated touchscreen drivers

2- if it's anything like the M7_U & UL models, then you first need to downgrade hboot separately and then run ruu; (in the M7_U/UL hboot 1.55 something was patched that doesnt allow RUU downgrade even with S-Off, you need to downgrade hboot first, then RUU will work)
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joho5
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Quote:
Originally Posted by nkk71 View Post
1- the "tp_" file is for updated touchscreen drivers

2- if it's anything like the M7_U & UL models, then you first need to downgrade hboot separately and then run ruu; (in the M7_U/UL hboot 1.55 something was patched that doesnt allow RUU downgrade even with S-Off, you need to downgrade hboot first, then RUU will work)
What he said....I fought with this last night and found out by trial and error that you need to have the hboot flashes first that corresponds with the ruu you are flashing.
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chuaniyang
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MY DEVICE INFO FROM BOOTLOADER SCREEN
UNLOCKED
M7_U PVT SHIP S-OFF RH
CID-HTC__621
HBOOT-1.55.0000
RADIO-4A.21.3263.04
OpenDSP-v32.120.274.0909
OS-3.63.709.3
eMMC-boot 2048MB

then i try to flash hboot v1.54 and get error like below :

C:\Android\sdk\platform-tools>fastboot flash hboot hboot.1.54.img
target reported max download size of 1526722560 bytes
sending 'hboot' (2047 KB)...
OKAY [ 0.371s]
writing 'hboot'...
FAILED (remote: not allowed)
finished. total time: 0.405s

should i flash different firmware via rebootRUU command ?
 
nkk71
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Has to be done in RUU mode, check my guide (in my signature) there is link and instructions to downgrade hboot to 1.44

Sent from my HTC One using Tapatalk
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downgrade, firmware, ruu
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