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Old 08-16-2019, 20:15   #11 (permalink)
rototen
Junior Member
 
Join Date: Apr 2014
Posts: 13
Member: 2171195
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Thanks Meter: 9
I had the same error to unlock it and after many failed attempts I was able to unlock it successfully.

I installed the stock firmware H91810p_00_0717.kdz and locked the bootloader.

Do the following steps:

1. Enable USB Debugging and OEM Unlock options
2. Install the TWRP on the LAF partition using this guide https://forum.xda-developers.com/v20...rsion-t3773443
4. Copy the Magisk-v18.0.zip to an SD memory https://github.com/topjohnwu/Magisk/...gisk-v18.0.zip
5. Boot the phone in Download mode (TWRP LAF)
6. Format the Data:
- Click to Wipe
- Click to Format Data
- Type yes
7. Go back to home screen and click to Install and select Magisk-v18.0.zip in the external_sd
8. Click to Reboot System> Do Not Install
9. Connect the phone to Wifi
10. Open the Magisk Manager app and update it (it is not necessary to update the Magisk 18.0 to the latest version)
11. Try to unlock again:
- Enable USB Debugging and OEM Unlock options
- In the USB connection select: File Transfer> Always

Log:

Using Version...1.0.0.0066
Selected Model GT-I5500
Selected Task TMB Unlock(ADB)

Searching ADB device Please wait..
Device Detected...
SELinux := Enforcing
model:= LG-H918
LG TMB Unlocking Started...
SU Version..18.0:MAGISKSU (
Device is Secure Rooted..uid=0
Reading Please Wait..
Please Wait while...
Please wait starting task...
Device Sn := LGH918xxxxxxx
Device Imei := 3522xxxxxxxx
Factory Ver := LGH918AT-00-V10p-TMO-US-JUL-17-2017-ARB01+0
Credits Left:= 90
Please Wait while...
Please wait starting task...

!!! Success !!!!
Restart Phone if not auto...
Total Time Take...00:00:16
 
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