What do you mean?
The hex patching?
I extraced the keystore from /system/bin/ using 7zip from the system.img from the LineageOS.zip (need brotli to uncompress from dat.br to to .dat, and sdat2img to convert from .dat to .img)
I used XVI32 (other hex editors should work), by using search, replace, then add 0074696D657374616D7000 in the hex string to find, and 0000000000000000000000 in the hex string to replace.