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

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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
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13th February 2018, 04:26 PM |#2  
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Confirmed working on US/Dev Unlocked s-off/s-on devices... Nice find...

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
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13th February 2018, 05:06 PM |#3  
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Thank You!
Quote:
Originally Posted by Wonders_Never_Cease

Confirmed working on US/Dev Unlocked s-off device... Nice find...


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.
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13th February 2018, 06:25 PM |#4  
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Quote:
Originally Posted by sabpprook

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
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13th February 2018, 07:12 PM |#5  
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Please Help ( Cid : HTC__034, S-on,Oreo Firmware
I want to Nougat.But RUU flash show me 12 zip error.
13th February 2018, 07:15 PM |#6  
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Quote:
Originally Posted by frostnicko

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
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13th February 2018, 07:38 PM |#7  
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S-On instructions are in Original post.. I just did the instructions for if s-off
13th February 2018, 08:15 PM |#8  
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Quote:
Originally Posted by Wonders_Never_Cease

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
13th February 2018, 08:20 PM |#9  
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Quote:
Originally Posted by cyrusct82

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)
13th February 2018, 08:24 PM |#10  
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Method confirmed working. Went from LeeDroid Oreo to latest Nougat RUU, now on Pure Fusion Oreo. US Unlocked, S-Off . Thanks for sharing.
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13th February 2018, 08:26 PM |#11  
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Quote:
Originally Posted by cyrusct82

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.
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