[G2 Q&A, Help & Troubleshooting] grandixximo:
I had a problem with my korean version LG G2 (i messed up some system files and i was stuck at reboot), i had to reflash the original kdz system file, and then i had to hack the phone network, and doing this also fixed all the network connectivity problems i had previously, which i tough was hardware but apperently wasn't.

I had to make extended searches to restore my phone to a working state, so i wanted to create a small guide for anyone interested in completly resetting phone to original and change to international network, this might work with D802 or other models too, but i have no idea, so try at your own risks, i am sure it will work on all the korean versions of the LG G2

Before you start for safety make a complete back up of your system

but most important backup up your QCN and backup your modem.img modemst1.img and modemst2.img all three of them in a safe place, you might need them if you want to restore phone basebands to old state, and i highly reccomend you do.

Backup is a very important precaution, please don't make me responsible for lost stuff, your internal SD will be completly erased, so backup everything you need, this will wipe clean everything on your phone.

If you are interested in where to get kdz files

http://csmg.lgmobile.com:9002/csmg/b2c/client/auth_model_check2.jsp?esn=

and write your phone IMEI after the = (found in settings or on the serial number of phone, under battery, korean version has battery removable)

Write down your imei because you are gonna need it again

Then to flash the kdz you can find tutorials on XDA

You should be on 4.4.2 when you are done (unless there is a 4.5 lollipop OTA in the future, finger crossed)

anyway after flashing frimware, the phone will only recognize branded SIM cards of the korean networks depending on what version you installed.

So if you want your phone to be international, and with all the sensors working and so on, you have to root the rom, install a recovery with autorec from cloudyfa

enter recovery and flash this http://pan.baidu.com/s/1jIe5o pass: us56

this is a link i found on a chinese forum, i downloaded the F320LSK_EDGE_V3.zip

after reboot give sometime for the mobile to find network, it will need 5minutes the first time, it did for me, after everything working perfectly

the only thing is your imei will be reset to 0

to fix this

http://www.droidviews.com/how-to-backup-and-restore-lost-imei-on-lg-g2/

the second part of this guide

I think this will help a lot of people with network problems, or those who have bricked and wasnt to restore the phone to a working state.

also after you are done you can install any rom you'd like, i'm on cloudyG3 and everything is flawless, just don't flash the baseband like reccomended, the proper baseband is the one i linked

I have no problems with wifi to 3G switching, i have no problem with 3G whatsover, there should be no problem also with 4G but i can't confirm that, haven't tried GPS extensivly yet, but it seems to be fine.

For what i can understand these files that you need to flash are the basebands of the 802 international model, so in theory this should fix problems for other models too, but i haven't tested, so do at your own risk