mardi 29 mars 2016

F400S + CM13 - Can't boot recovery [TWRP] + Fastboot not working - Win10 x64

Morning All

I've been running CM13 for a while now on my F400S but was having issue with TWRP not backing up all my data. I figured that this may have been because I recently encrypted my device and I was using TWRP 2.8.70 and not 3.0.0.0.

I installed TWRP Manager and allowed it root access, told it to install 3.0.0.0 which then resulted in me getting the "Secure Booting Error! Cause: Boot certification verify" message when the device restarted.

My device still boots into CM13 and is useable, I just can't get into TWRP. I've looked at the LG Flash tool both the old and the 2014 versions, but I'd prefer not to wipe the device and rebuild it from scratch if possible. I could if needed and my most recent backup is the 20th March.

I wondered if I could use ADB and Fastboot to flash TWRP 3.0.0.0 to the device and hopefully rectify the issue. However I can't seem to get Fastboot to speak to the device.

ADB gives me:-

C:\adb>adb devices
List of devices attached
LGF400S5af0af79 device


However, Fastboot gives me:-

C:\adb>fastboot oem get_identifier_token
< waiting for device >


....and never retreives any information.

I've tried the following drivers [I'm using Windows 10 x64]:-

LGUnitedMobileDriver_S50MAN310AP22_ML_WHQL_Ver_3.1 0.1
LGUnitedMobileDriver_S51MAN312AP22_ML_WHQL_Ver_3.1 2.3
LG-Mobile-Driver_v3.14.1
LGMobileDriver_WHQL_Ver_4.0.4
and also the driver that the LG Mobile Support Tool downloads which I believe is 3.08.

I forcefully selected the driver to use via Device Manager, rebooted but Fastboot still doesn't seem to connect to the device.

I'm not sure if I'm going about this the right way, or if anyone can suggest any alternative driver or method of resolving the issue with TWRP please?


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