Sunday, 24 July 2016

LG G3 Stuck In Bootloop



Hi XDA, many threads here have helped me in the past so time to ask another (probably stupid) question. It's a bit of a long story so I apologise in advance.

I've been running CM (one of the nightly builds from about 3 weeks back, don't have the file so I can't say which) on my phone for a while with no issues until a couple of nights ago when it was overheating (charging while playing a game, stupid I know) so I decided to turn it off so it could cool down without taking it off charge.
The following morning I turn it back on to find that it's getting to the blue android head logo of CM and getting stuck there. First thing I do is reboot into TWRP and flash my backup from right after I installed CM. Reboot and... same result. Okay, no biggie right? Time to reinstall CM (the latest nightly build from yesterday) and Google Apps (nano package) via TWRP and reboot again. Still stuck at the blue android head logo. The reinstall was handled after using the Wipe-Factory Reset function of TWRP, as the guide here explains.

At this point I decide to do a bit of research and learn that it's called a softbrick or bootloop and apparently flashing the stock rom can fix it. The LG software suite won't even recognise the device but a friend of mine found this guide so I attempted to run through it. All goes well until it comes time for the software to connect to the phone - I pop it in download mode while putting the USB cable in, the program says waiting for connection, runs for 14 seconds and says it's trying to put the phone into download mode, at this point it fails saying the phone can't be put into download mode.
Some of the comments beneath the article offer fixes like using USB 2.0 instead of 3.0, putting the program into compatability mode for Win7 and running in administrator mode. To be thorough I tried every USB port on my machine (both 2.0 and 3.0) and run the program in compatability mode (with and without admin mode) for several versions of windows. Same result every time.

Another friend then suggests that somehow permissions got borked and it might be worth reflashing SuperSU to the system but at this point I'm at a loss for how to do that. I have the one click root script that I got from god knows where (not this one because that didn't work for me) that has a SuperSU zip in it, presumably it flashes that to the phone when it runs (found this out the hard way because I've been a moron in the past and tried installing SuperSU through TWRP and broke the boot previously, fixed by re-running the one click root script - this was ages ago before even installing CM.)

So right now I can put the phone into download mode manually, get into TWRP and use all its functions as well as connect to my PC and use ADB functions while the phone's in TWRP but can't boot into CM or flash a stock rom. Any help would be appreciated, I've spent a whole day reading guides, asking friends and clumsily trying to fix this only to get nowhere.



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