[Black"SLI"jack]

quel metodo di reset che avevo specificato è per aquaero 5 e 6.

per gli a4 la questione è diversa. ti metto l'estratto del manuale.

20.1. Deletion of all Settings (EEPROM- 20.1. Deletion of all Settings (EEPROM-Reset)

In individual cases it can occur that the settings stored in the device are
destroyed for example if the power supply to the device is interrupted
during a writing process. In this case, all default settings can be reinitialized. To do this, hold the button "set/mode" when switching on the device. The Display will read "Warning EEPROM-Reset, please hold 3 seconds". After a successful deletion, "EEPROM resetted" will appear in the
lower line of the display. Please let go of the button, the device will restart automatically.