Can't boot image on H850

[joeitu]

• I am running an official build of TWRP, downloaded from https://twrp.me/Devices/
• I am running the latest version of TWRP
• [ X] I have read the FAQ (https://twrp.me/FAQ/)
• I have searched for my issue and it does not already exist

Device codename:H850
TWRP version: probably 3.3 ( maybe 3.2)

WHAT STEPS WILL REPRODUCE THE PROBLEM?

( go back in time, spring 2019 )
Install lineageOS on H850
( break it, wait one year to fix it, forget PIN )
try to boot on TWRP versions 3.4, 3.3 and 3.2
run :

./fastboot boot ./twrp-3.3.0-0-h850.img

WHAT IS THE EXPECTED RESULT?

The command successfully finish, and I can now boot on TWRP

WHAT HAPPENS INSTEAD?

I get the following error:

< waiting for any device >
Sending 'boot.img' (21100 KB)                      OKAY [  0.753s]
Booting                                            FAILED (remote: 'unknown command')

ADDITIONAL INFORMATION

/tmp/recovery.log:
dmesg: