After some more hours of testing (backup restore was fine in fact, nothing seems to be different with or without), I only have ethernet not working with beelink dtd rebuilt by myself (from firmware, not from running Android, so I think beelink has changed something with ethernet, without specifiying dtd, all is correctly dedected).
Always some freezes/restarts of Kodi, cpu is not overloading while playing something, dvb is ok (rtl2832u), so all is quite good from now except those freezes/restarts.
I also tested retroarch : I also have some unexpected restarts.
Tvheadend working fine with m3u playlist source and dvb source.