Hello guys, I have great news, I have successfully upgraded my F2-220 from 6.2 to 7.1.
I have followed this method/mod/hack from THE SAINT @pocopico Install DSM 7 on BareMetal or VM based on Redpill
-BIOS is set to UEFI, in Legacy mode it kept booting with black screen
-I have used the automated script to create VID,PID, only the MAC is changed by hand.
-I have chosen the DS918+ with the apollolake-7.1.0-42661 configuration