[Please help] Yufly F9 lost signal after OTA failed

[Lê Nguyễn Hoàng]

Hello and Happy new year to Hovatek!!
My phone is Yuffly F9.
Last time, after rooted by patching boot.img using magisk. There is an OTA and i update via OTA, after download complete, the device is restarted and say failed when install update:

After that, the device lost signal, no sim card, radio off...Bluetooth, wifi and everything else working perfectly.
I tried to flash original boot.img, reflash the ROM using QFIL but nothing work.
The Sim card work on another device.

Code:

[b]Current System:[/b]
Android 7.1.1
Baseband version: TA.2.2.c1-00452-8976_GEN_PACK-1
Kernal version: 3.10.84
Build number: YU-FLY_F9_7.1_16_090
[b]IMEI information:[/b]
IMEI (Slot1): 863845032239604
IMEI SV (Slot1): 00
MIN (Slot2): Unknown
PRL version (Slot2): Unknown
MEID (Slot2): 00000000000000
IMEI (Slot2): 863845032239612
IMEI SV(Slot2): 00
ICCID (Slot2): Unknown

[b]In SIM Status:[/b]
Network: Unknown
Signal Strength: 0
Cellular network type: unknown
Service state: Radio Off
Roaming: Not Roaming
Cellular network state: Disconnected
My phone number: unknown
IMEI: 8663845032239604
IMEI SV: 00

Currently, device is rooted and TWRP installed.

Is there anyway to fix this issues?
Thank you.

[EMMANUS]

Are the IMEI numbers same as your original?
Do you have full backup of your rom before the root?
What error did you get while trying to flash?

[Lê Nguyễn Hoàng]

Are the IMEI numbers same as your original?
Do you have full backup of your rom before the root?
What error did you get while trying to flash?

I'm not sure if IMEI is same as original.
No, i don't have backup, because no root, twrp, and miracle (patched) box don't work.
After download OTA updates, the phone is restart then It showing above picture with only a text "error"

[EMMANUS]

You can verify IMEI from the labels at your battery compartment.
Backup your firmware as it is , then download and flash stock rom for your phone.

[Lê Nguyễn Hoàng]

You can verify IMEI from the labels at your battery compartment.
Backup your firmware as it is , then download and flash stock rom for your phone.

They not print anything, i tried to disassembly the phone but no info of imei print on it. I already flash stock rom but no help.

[hovatek]

They not print anything, i tried to disassembly the phone but no info of imei print on it. I already flash stock rom but no help.

I need to clarify something. Did you flash the full stock rom?
Have you tried setting network to 2G only?

[Lê Nguyễn Hoàng]

[img=862x1532.44]https://i.imgur.com/CuH7zrz.png[/img]

They not print anything, i tried to disassembly the phone but no info of imei print on it. I already flash stock rom but no help.

I need to clarify something. Did you flash the full stock rom?
Have you tried setting network to 2G only?

The only rom that avaiable for me is using QFIL. So i think it'll flash full rom.
Can not switch, its stay at 4g/3g/2g, if i chose 2G, nothing happen


I tried *#*#4636#*#* also:

[hovatek]

The only rom that avaiable for me is using QFIL. So i think it'll flash full rom.
Can not switch, its stay at 4g/3g/2g, if i chose 2G, nothing happen


I tried *#*#4636#*#* also:

Try setting Cellular Radio Power to On

[Lê Nguyễn Hoàng]

The only rom that avaiable for me is using QFIL. So i think it'll flash full rom.
Can not switch, its stay at 4g/3g/2g, if i chose 2G, nothing happen


I tried *#*#4636#*#* also:

Try setting Cellular Radio Power to On

It not work, it "virtually" on but when we refresh, or access that menu again, its off

Btw, i think IMEI is original, because i flashed another QFIL firmware but the IMEI is same.

[hovatek]

It not work, it "virtually" on but when we refresh, or access that menu again, its off

Btw, i think IMEI is original, because i flashed another QFIL firmware but the IMEI is same.

Can you lay your hands on a QCN backup from a working phone of the same model?