[G3 Q&A, Help & Troubleshooting] reepje123:
Hey guys, I need your help!

I tried to make my long story short, but that didn't work, so here's my complete story:

When everything was fine, I had CM13 running with TWRP 2.8.5.0.

My first intention was to restore a Stock 4.4 Backup and update it to 5.x. After restoring it didn't boot, so I did a factory reset and it worked.

Next I wanted to update to 5.0 via OTA, but that ofc couldn't work because of TWRP.

I knew the only way to update to 5.x was to flash a .kdz an lose all data. I didn't want to do that, so instead I tried to flash the official 30B image from here.

I followed the instructions given in the first post (updated TWRP to 2.8.7.0 too), but after flashing the files and hitting the "reboot system" button in TWRP it booted into TWRP again. I tried flashing again because maybe something went wrong. I even downloaded all the files again to make sure I didn't have a bad download, but no luck. So I restored the previous CM13 6.0.1 rom. At first it didn't succeed because my internal memory was full, but after deleting the 30B files it restored just fine. So when it was ready I hit the reboot button aaaannd it booted into TWRP AGAIN...

I searched the internet and found a "LG_G3_Flash2FixStuckRecovery.zip" file, but that didn't help either. (I connected my G3 to my pc using MTP in TWRP to backup all important data, so I don't care if I need to wipe everything.)

Now I knew something went badly wrong and tried using the LG flashtool 2014 for .kdz and another one for .tot files to recover my G3.

Still no luck. When using the 2014 tool and the official 30B kdz it runs till 100% at my phone (at the same time it reaches 80% on my pc at the LG mobile support tool). But then it's only showing the LG logo for some seconds, screen black, lg logo, black, ... an infinite loop.

When using the .tot method I can't get past the "Model Information Check FAIL!" message. It looks like I lost my IMEI because it shows "IMEI: NULL". I got an EFS Backup in a zip file though, so it's not completely lost. I tried both methods on 2 different pc's with win 8.1 and 7 (and win10 for some things), but I always get the same results.

When turning it on using the power button, I see the LG logo followed by a black screen and again the LG logo.

When connecting it to the charger I at first see a charging screen, not the charging animation, but the "loading" battery screen you get before the animation. But after it I get stuck in the above mentioned LG logo.

It's possible to get to the factory reset screen, but I get to the LG logo again after "performing" a factory reset. Note: On the factory reset screen, there is a blue "part" on the top of the screen which looks different compared to when using CM13 and Stock 4.4. The blue color is darker, so I guess, I partly got 30B installed.

I didn't plan to write that much, but I think it's better because I described almost everything I did.

I have no idea what to do now, I tried everything I know and could find on the internet.

So I just hope someone is able to help me getting my G3 working again. :)

Many thanks!

tl;dr: Only download mode left, but can't succesfully flash any stock rom.