tried every combination before like vol down + power, up + power, up + down + power, down + home + power, etc. none makes difference other than normal boot.
The only option that works for the LG34C is Safe Mode by holding the power and volume down and then release power and keep holding volume down.
I assume you read previous posts and tried jumping the battery terminals to discharge any memory settings and I would hold down the power button with battery out and no power cable, too. That worked for me when my phone was stuck in a loop.
I did not even try adb, because I would not know what to do there. I just opened the LG mobile System Tool and it connected and I tried the Upgrade Recovery option with no luck, eventually it booted completely into the Safe Mode and I just Reset the system.
I removed battery and pressed power button for a 5 seconds and then battery back and held power and volume down until it buzzes and I release the power button while still holding volume down and I release the volume down once the Safe Mode screen comes up and it rebooted next time in a working system.
Thanks for help on this. Still didn't succeed. hope my post does not divert the thread.
Tried LG mobile System Tool for safe mode. it recognized my phone AS L34CV10, then I started upgrade recovery, but always got error saying like "connection problem, disconnect phone pull out battery then try again".
also tried quite a few times for safe mode by down + power without success. have questions:
1. is power held when battery back after 5 seconds holding? I managed to hold power all the way from start until battery back and start buzz.
2. is phone screen still black when release the power? it seems LG logo appear at the end of buzz.
3. when safe mode appear? before LG logo or after LG logo or after blue track phone screen.
Just release the power button once you are sure the phone is on, don’t worry about timing it you have plenty of time, I was able to boot into safe mode by pressing volume down at the end of the LG screen cycle, too. The safe mode will come up after the blue track phone screen.
I assume you are not able to access through the adb command prompt and you are stuck at the unauthorized device prompt. Maybe just keep entering adb shell and see if there is a system quirk and it allows you access.
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