I’ve picked up a second hand unit today after years of wanting one. Took it home and set it up, it stated on the app that I needed an update so I clicked on the update. once clicked on it states that it is updating and to not switch off (standard protocol) but when this happens the unit immediately loses its Bluetooth connection and won’t update. the unit has 4 lights that are constantly either flashing/on but I can’t use any features on the amp ive bought an expensive paperweight it seems. can anyone help?