[G2 General] renaltosonylevi:
It can get really confusing reading these forums when you see people throwing around terms like modem, radio,bootstack, boot loader and baseband. Often these terms are used incorrectly or to make life even harder they are being used correctly but they are talking about different models(ie vs980). So sometimes what makes sense on one model is complete garbage for another.

Now let's be clear we are talking about the d802 here and to avoid all confusion let start from the beginning.

You have your shiney new lg g2 d802. The problem is the stock ROM is garbage, its crammed to the Gill's with bloatware and its so ugly that windows 95 looks good by comparison.

The only solution? Custom modified Roms. How do I do it .pleeeaaassseee help.

Step 1

Get root access. Lg like to make this hard to do (and it gets harder with each update)but it can be done. Towl root or stump root from what I hear these days will work.

Step 2

Download and Run auto rec. There are a few simple steps to this ie just read the instructions.

Step 3

Now you have run autorec your phone will have twrp 2.7 installed also your bootlaoder will have been downgraded to jelly bean, plus you now have modified kernel. The reason you have a modified kernel is so your KitKat rom will boot on the jb boot loader.

Step 4

Go and buy a USB otg cable and memory stick. They are cheap and they handy to have.

Step 5

Install off google play some reboot widgets so you will have an easy way to make your phone boot into recovery. Also practice the vol down+ pwr combo to enter recovery. It is best to know how to do this before you get stuck in a bootloop.

Step 6

Search google for the latest twrp " lg g2 d802 blastagator twrp". Blastagator is the developer for twrp for lg g2's.

Step 7

Reboot into recovery, select the install option, navigate to ware you down loaded the twrp zip and select it and flash.( or plug ln the memory stick with the zip)

Step 8

Reboot the recovery. At the top of the screen you should see a new version n.o.

Step 9

Backup your current set up on to your memory stick. Just tick all the boxes and give it a name that makes scene (original stock4.42 + date).

I did this on twrp 2.7 and as a result it will not restore properly.

OK I got carried away but where was those instructions a year ago.

Now your phone has the jb boot loader installed but you still have the original kk modem/radio. On this version of cm 12 it probably will cause you no trouble but on some Roms it will cause you to have no screen rotation, GPS,proximity sensor and auto bright ness. All of those functions are part of the modem. You can test if all those things are working by downloading "phone tester".

When you "flash" a ROM the modem and boot loader remain from whatever was left previously.

I have found that " clodyfa's modified kk modem has worked perfectly on every ROM I have installed.

Bootloaders; you most likely will never need anything other than the jb bootloaer that was installed with autorec.

Every custom ROM there is for the d802 uses the Loki exploit which only works with the jb bootloader(except for simple ROM and you would haft to mad to want that pile of used dog food on your phone).

In the future we may see some "bumped" Roms that require the kk boot loader but there is nothing yet.

I hope this rambley rant will help someone PS it only when your phone is bricked (no download mode)and you are booting up your PC on Linux to fix it ,the real learning starts.