EP760 off-grid after FW update

@BLUETTI_CARE I just proceed to the update of the FW of my EP760 and battery pack B500 and now my inverter is staying off-grid.

As you can see, my grid is proper (230V@60Hz) and the system has been working properly for more than 1 year now.

Can I revert the FW? I tried the self-adaptation to no success.