Thanks for advices so tested both and it looks like both are still early testing images, not usable at all ! Mac address changes at each boot (so no way to give it a a fixed lease in DHCP) and if you put in fixed IP address when it reboots network never comes back
Interesting bug too: after doing system updates with apt update/upgrade, you can never reboot the system (RED led on board at boot !!).
If someone is interested by an useless Orange Pi One Plus v2 board let me know or it'll go to electronic recycle bin and I'll know to never buy again any Orange Pi board (no support at all from manufacturer