following setup Multiplus 2 48/3000 / 35-32 Fw. 481 Cerbo GX 2.63 3 US 2000 Pylontech MPPT 100 20 V.156 EM24 grid meter for grid ET340 for PVA Internet connected via LAN I Wanted to switch to firmware 2.66. After the attempt, V. 2.63 was still displayed at the Cerbo, and the connection to the VRM portal was interrupted for ca. 30 minutes.. I tried it twice and then found that the Cerbo no longer had any old backup software. Any ideas? Robi