get KDZ 20v .. once downloaded unzip it.
install LGUP follow instructions only 2 files.
place phone into download mode vol up- then plug usb cable.
open LGUP. tick upgrade... lower i think it says bin next to a box . untick.. and 3 dots will appear. click to browse to KDZ file once you find it. select it. noe next youll see the new KDZ in lower part not on top.
exit program then open it again this time select refurbished click start... NOTE you cannot rollback to lollipop or MM 20i or lower.
refurbished will wipe clean all phone.
for twrp use this .. its official
https://xdaforums.com/showpost.php?p=72404188&postcount=414
i use minimal adb fastboot. so what i do is place the twrp.img there. in c/program files /minimal adb.. and in that window in an empty space... click and hold shift KEY and then on mouse right click and select open command prompt here.. and jus make sure the command has same name as the twrp or rename twrp.img and edit the command to be the same
fastboot boot twrp.img
place a copy of the same twrp so you can install it permanently. once you boot into twrp. click install then lower part click on image browse for twrp.img and install.. make sure to tick recovery flash and you should have it permanently.
hopw i made some sense..
Using Minimal I tried this:
Install via ADB
Open the folder where your TWRP Recovery .img file is saved.
Then open a CMD window inside that folder. To do that, Shift + Right click on any empty white space inside the folder and then select Open command window here.
Connect your Android device to the PC. Type the following into the command window to boot your device into bootloader/fastboot mode:
adb reboot bootloader
└ If your asks for permission to “Allow USB debugging”, tap OK.
Once your device boots into bootloader mode, type this into the command line.
fastboot flash recovery twrp-2.8.x.x-xxx.img
└ Here modify twrp.img with the name of your TWRP recovery .img file.
Once TWRP is successfully flashed on your device, type this final command to reboot your device.
fastboot reboot
And I get this:
C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot flash recovery twrp.img
target reported max download size of 536870912 bytes
sending 'recovery' (32340 KB)...
OKAY [ 1.068s]
writing 'recovery'...
FAILED (remote: unknown command)
finished. total time: 1.088s