[G2 Q&A, Help & Troubleshooting] MarshisnotMellow:
to upgrade from kitkat you need lp or hybrid bootstacks. they have images (. img files) that are needed for your phone to function properly., like aboot, modem, radios etc. Hybrid bootstack contains aboot from kk and everyhing else from Lp. So when youll flash a bootstack, youll need to wipe everything, except internal storage(or external if you have one) , before you can flash it. that wipe will include, cache, dalvik cache, system, data. so basically all the old system stuff will be gone before you can flash this bootstack. i hope after reading that youll know that you cant access your old kk installation since itll be wiped, therell be nothing to boot to. if youll try, it will give you errors on lg logo.

understand it like this, to install new 21 inches tyres to your car, you need to upgrade the rims to hold a 21 inch tyre right? what will happen if you just put the 21' tyres on old 15' rim or old 15' tyres on new 21' rims? :cool:

the cm 13 devs dont recommend you to flash bootstacks because most of the models took the official lollipop update, which put everything in their phone to lolipop level. since there is no official marshmallow(MM) bootstack for our phone (because no official update), everyone developed ways to utilize lollipop bootstack to function on a custom MM Rom. Since most models are already on lollipop, theres no need to flash lollipop bootstack while flashing custom rom. That step is mostly for those who are still on stock or custom kitkat based rom. So they say to get official lollipop through kdz method, instead of flashing Lp bootstack before gettig their rom. But remember if a rom developer asks to install a bootstack for their rom, you should consider it if you dont have much knowledge about it, cause if you dont follow instructions, you can soft brick, in that case youll need hybrid bootstack.

see if you are using everyhing proper for your phone then your phone wont brick. only thing that can go wrong with that condition is your execution, your steps. As long as you dont make a mistake in these steps everything will go fine.

ill explain it what you should do.

1. first root your phone.

2. when done rooting, install "root checker" from google play. itll confirm if you have root or not.

3.Then you come back here and find autorec app from the link i gave you in my previous reply. download that, install the autorec app. and follow on screen instructions and itll install twrp recovery for you.

4. then come back here again, and find blastgator's twrp, from the same link in previous post. itll be the one whih says "twrp with f2fs". download it and remember where you put it.

5. turn off phone, boot into recovery (i hope you've learned by now how to get into recovery of your g2 model). Now youll be in recovery, hit install button there and find where you put that file, flash it, then reboot recovery, youll have new recovery after that. then you reboot into system.

now upto this point, you can play along in your kk, have fun with features, say last goodbyes and all lol. Because everything stock kk related will be gone, past this point, including all the apps you have installed.

[IMPORTANT] : after rooting and installing recovery, get bootstack zip, rom zip and gapps zip files downloaded and placed together in a folder on your phone, before you start with flashing bootstack. Because you wont be able to boot back into system after flashing just bootstack.

now you prepare for MM, boot into recovery, now since you are in kk, you need to install LP bootstack, and for that you need to wipe everything using your recovery's wipe feature.

6. in recovery, hit wipe, hit advanced, select cache, dalvik cache, system, data. [ Dont select internal storage otherwise all flashing files will be gone and youll be left with a brick.] and wipe.

7. Now hit the back button to go back to main recovery screen once wiping is finished. hit install, flash the bootstack zip.

8. now your phone has new bootloader but its still empty, like you got a body but no soul :cool:. so hit back button, hit install and flash the rom zip you downloaded.

9. now flash gApps same way.

10. once its done, just hit reboot system. no other steps needed.

11. be patient, first boot takes longer than normal boot.

12.enjoy MM :highfive:

you probably know these steps from all the reading but its for your reference, so you dont screw up at all and be safe from bricking.

you can get google apps from opengapps website. you need to get ARM-> 6.0 -> (your prefered ones) pico/nano/micro/etc.. pico has the least amount of gapps, all important ones are there in pico, then extra will increase as you go up from pico to stock. stock has all the gapps. size will also increase as you go up. so choose as you prefer.

now once you have a cm13 /MM based rom, you wont need to flash bootstacks for other roms from next time unless the developer instructs to do so.

good luck :cool: