Here's how to flash los by
@FireLord without any errors and working volte.
1) download the fastboot firmware package from
https://forum.xda-developers.com/le...k-firmware-t3649914/post73246564#post73246564
Follow the instructions and use s62 firmware package.
2) once booted in s62 stock rom, don't flash twrp or do anything other than installation of OTA from settings>>about phone>>system update here you will be able to see an OTA of about 100mbs approx which will update your system to s232
3) simlarly repeat step 2 after completion of s232 in your P2 this this OTA will show update available to s233 & then to s244.
4) Looks like your device has now booted into s244 stock rom with stock recovery and by updating your device by stock recovery and Lenovo OTA's.
Now flash TWRP using guide available on xda
https://forum.xda-developers.com/le...covery-unofficial-twrp-lenovo-p2-3-0-t3533659
5) now you have twrp booted on your device now check #2 , #3 there is a guide available on changing data from f2fs to ext4 follow it and change data to ext4
4) MOST IMPORTANT STEP reboot your system after changing data to ext4 and dont flash anyother packages without a boot.
5) setup your device.
6) boot back into twrp and follow instructions for flashing lineage os as instructed here
https://forum.xda-developers.com/lenovo-p2/development/rom-official-lineageos-14-1-t3664052
l hope you have successfully booted los without any issue.
Please let me know if I have missed something.
How do I know this will work mentioned in #1 also I'm a beta tester and have tested over 69 builds so ik some stuffs
Feel free to hit that thanks/thumbsup button if this helps you.