[X3non]

...
Because while flashed via fastboot it gives me bootloop
is there problem with vendor??

ensure that you have disabled dm_verity, perform a factory reset using stock recovery after flashing the rom
if you still have bootloop then you must be using a wrong rom, ensure to try roms from both a-only and a/b to find out which works for your device
if you still any other problems then create a new thread for your device issue by clicking "Ask Question" at the top