How to get back to stock topic

Hi, i need some help to get back a hox to stock ... the problem is that the phone is not mine and i think that's something went wrong with ... now a venom roms is flashed on ( no wifi no signal and no caméra ) on bootloader i have :
Unlocjed
Endeavoru pvt ship S-ON RL
Hboot-1.73.0000
CPLD-None
MICROP-NONE
Radio-5.1204.167.31
...
with "getvar version:main" i get : 4.19.707.3

thank you