BV9500

lineage install

lineage-19.0-20211106-UNOFFICIAL-treble_arm64_bvS.img.xz

apply these settings from developer menù:

OEM unlock

debug usb

adb commands

adb devices # confirm on screen
adb reboot bootloader
fastboot flashing unlock
# press volume up to confirm

flash system

fastboot flash system lineage-19.0-20211106-UNOFFICIAL-treble_arm64_bvS.img