this method has problema) install userdebug gsi (phh, los, leos etc) with dsu sideloader apk from github
b) take any recovery for your phone and change prop values for adb root in recovery
boot into gsi or recovery
adb pull /dev/block/by-name/boot
change rhe prop of reocovery.img
chaning prop 126.96.36.199 recovery.img and flash to 188.8.131.52 device is working fine.
but when I flash to 184.108.40.206 device
with same 220.127.116.11 recovery.img
it has bricked.
So I flashed original recovery.img of
it is bricked status
So I send china, get mainboard change.
I guess if we want to get boot.img from flashing recovery.img
middle version (14. / 15. / 16. ) is important.