Made the update with MacOS via USB Midi using Sysex Librarian. No issue.
Made GLOBALS + WRITE
BUT
The synth was badly out of tune.
Made Globals + 0 but stucked at F22 for 3 Times
Reset the Temp Table with Globals + 3
Then the Temp calibration went OK
BUT
The synth is still out of tune in a weird way:
on the keyboard I play A, B, C, D, E, F, G, A, B
with oscillator at C0 (or C1) the OB6 plays something like
A1,A2,D,E,F,G,A,B
on C0 plays C0, on C1 plays A, on C4 plays C4
now it's late I have to turn it off, but there's something very wrong with tuning and I think it's related to the firmware update....