[SOLUTION] No IMEI / Signal after downgrade Oreo 8.0 to Nougat 7.0

sabpprook · Feb 13, 2018

I found a post explain how to get IMEI back.
original post: http://bbs.gfan.com/android-9272781-1-1.html

Two methods for S-ON or S-OFF device, please do it under Nougat 7.0 firmware installed.

S-ON
1. Reboot to TWRP recovery
2. Use the command below to erase persist partition

Code:

adb shell
dd if=/dev/zero of=/dev/block/bootdevice/by-name/persist

S-OFF only
1. Reboot to bootloader (not download)
2. Use the command below to erase persist partition

Code:

fastboot erase persist

Is that possible to downgrade without S-OFF??
Please watch my video, HTC 10 can downgrade in the same method!!!

PS. This video is for HTC One M9, please use Nougat RUU/firmware for HTC 10 to do downgrading.

https://www.youtube.com/watch?v=vJrNEsWVyOc

Wonders_Never_Cease · Feb 13, 2018

Confirmed working on US/Dev Unlocked s-off/s-on devices... Nice find...:good::good:

Steps for s-on device:

1) Reboot to TWRP recovery
2) Install latest adb tools on your PC.
3) Plug in phone to PC. On PC run cmd prompt. Navigate to adb folder. Use the command below to erase persist partition on your phone:
Code:

adb shell
dd if=/dev/zero of=/dev/block/bootdevice/by-name/persist

4) Flash stock recovery
5) Relock bootloader
6) Run the RUU for your phone

Thanks @ssmud

Steps for s-off device:

1. Copy firmware zip to where your adb/fastboot is located
2. Reboot device into download mode
3. Connect phone to computer
4. Run command fastboot flash zip name of firmware.zip(run command twice if have failed message)
5. Do NOT restart device, immediately reboot to bootloader
6. Run command fastboot erase persist
7. Reboot to download mode, Flash RUU for your device IF available.

Alternative Untested but should work fine

1. Copy firmware zip to where your adb/fastboot is located
2. Reboot device into download mode
3. Connect phone to computer
4. Run command fastboot flash zip name of firmware.zip(run command twice if have failed message)
5. Do NOT restart device, immediately reboot to bootloader
6. Run command fastboot erase persist
7. Reboot to download mode, flash twrp for device
8. Format and wipe device
9. Flash backup of your devices region
10. Reboot

2.51.617.32 RUU

2.51.617.32 Firmware

Most other files for devices are located here

saxena.siddhu · Feb 13, 2018

Thank You!

Wonders_Never_Cease said:
Confirmed working on US/Dev Unlocked s-off device... Nice find...:good::good:

Steps for s-off device:

1. Copy firmware zip to where your adb/fastboot is located
2. Reboot device into download mode
3. Connect phone to computer
4. Run command fastboot flash zip name of firmware.zip
5. Do NOT restart device, immediately reboot to bootloader
6. Run command fastboot erase persist
7. Reboot to download mode, Flash RUU for your device IF available.

Alternative Untested but should work fine

1. Copy firmware zip to where your adb/fastboot is located
2. Reboot device into download mode
3. Connect phone to computer
4. Run command fastboot flash zip name of firmware.zip
5. Do NOT restart device, immediately reboot to bootloader
6. Run command fastboot erase persist
7. Reboot to download mode, flash twrp for device
8. Format and wipe device
9. Flash backup of your devices region
10. Reboot

Relevant Username.

firedown_3 · Feb 13, 2018

sabpprook said:
I found a post explain how to get IMEI back.
original post: http://bbs.gfan.com/android-9272781-1-1.html

Two methods for S-ON or S-OFF device, please do it under Nougat 7.0 firmware installed.

S-ON
1. Reboot to TWRP recovery
2. Use the command below to erase persist partition

Code:

adb shell dd if=/dev/zero of=/dev/block/bootdevice/by-name/persist

S-OFF only
1. Reboot to bootloader (not download)
2. Use the command below to erase persist partition

Code:

fastboot erase persist

Thank you
Confirmed working on HTC10 taiwan s-off device

frostnicko · Feb 13, 2018

Please Help ( Cid : HTC__034, S-on,Oreo Firmware
I want to Nougat.But RUU flash show me 12 zip error.

cyrusct82 · Feb 13, 2018

frostnicko said:
Please Help ( Cid : HTC__034, S-on,Oreo Firmware
I want to Nougat.But RUU flash show me 12 zip error.

You must be S-off.
WTF PEOPLE READ AT LAST SOMETHING ABOUT WHAT YOU WANT TO DO ON YOUR DEVICES.

Sent from my HTC 10 using Tapatalk

Wonders_Never_Cease · Feb 13, 2018

S-On instructions are in Original post.. I just did the instructions for if s-off

cyrusct82 · Feb 13, 2018

Wonders_Never_Cease said:
S-On instructions are in Original post.. I just did the instructions for if s-off

Ok
But how it can downgrade from Oreo to Nougat if it is S-ON?

Sent from my HTC 10 using Tapatalk

frostnicko · Feb 13, 2018

cyrusct82 said:
Ok
But how it can downgrade from Oreo to Nougat if it is S-ON?

Sent from my HTC 10 using Tapatalk

I want know this.i work for Oreo to Nougat but fail ( RUU and Sneaky Firmwares)

shortyboy · Feb 13, 2018

Method confirmed working. Went from LeeDroid Oreo to latest Nougat RUU, now on Pure Fusion Oreo. US Unlocked, S-Off . Thanks for sharing.

yldlj · Feb 13, 2018

cyrusct82 said:
Ok
But how it can downgrade from Oreo to Nougat if it is S-ON?

Probably for people who didn't update firmware. Ie flashed leedroid ROM without Oreo firmware first.

frostnicko · Feb 13, 2018

Anyone explain S-ON Oreo to Nougat Downgrade instructions ? Please.

cyrusct82 · Feb 13, 2018

frostnicko said:
Anyone explain S-ON Oreo to Nougat Downgrade instructions ? Please.

With a RUU you cannot downgrade while you are S-ON.
Try maybe will work if you flash a Nougat Rom with TWRP and you do the command for S-on in TWRP to erase the persist partition.

Sent from my HTC 10 using Tapatalk

frostnicko · Feb 13, 2018

cyrusct82 said:
With a RUU you cannot downgrade while you are S-ON.
Try maybe will work if you flash a Nougat Rom with TWRP and you do the command for S-on in TWRP to erase the persist partition.

Sent from my HTC 10 using Tapatalk

But We must flash Nougat Firmware.Nougat rom work with nougat firmware

yldlj · Feb 13, 2018

frostnicko said:
But We must flash Nougat Firmware.Nougat rom work with nougat firmware

It's for people who didn't update firmware. Just S OFF your phone and be done with it

fmedrano1977 · Feb 13, 2018

Will this work to go back to everything Nougat for those that flashed US unlocked Oreo RUU. I'm s-off but get error trying to flash Nougat RUU.

Sent from my HTC 10 using Tapatalk

jc8bit · Feb 13, 2018

Hello,

Can anyone share Nougat Official RUU? (for US Unlocked)

Thanks

yldlj · Feb 13, 2018

jc8bit said:
Hello,

Can anyone share Nougat Official RUU? (for US Unlocked)

Thanks

HTC has them

jc8bit · Feb 13, 2018

yldlj said:
HTC has them

Already checked on HTC Dev, it seems are not available, I will search some mirror host.

Thanks

Wonders_Never_Cease · Feb 13, 2018

You cannot just flash Nougat ruu,as per instructions you have to flash firmware first if s-off... Please read second post...

fmedrano1977 said:
Will this work to go back to everything Nougat for those that flashed US unlocked Oreo RUU. I'm s-off but get error trying to flash Nougat RUU.

Sent from my HTC 10 using Tapatalk

---------- Post added at 02:26 PM ---------- Previous post was at 02:21 PM ----------

2.51.617.32 Firmware and RUU links posted in 2nd post

[SOLUTION] No IMEI / Signal after downgrade Oreo 8.0 to Nougat 7.0

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