Thank you so much for your feedback, I've managed to sort out 3 of the 067/068 with the fan issue , and this new one installed at my parent's house go figure would be a headbanger,Thanks again will contact them again tomorrowok seems to be connected to your Production Number on the barcode sticker on the lower side. Mine have a Production number on the end 13200 and both work with the 067 068 Firmwares. Seems Growatt changed recently again hardware components. As they also change the firmware I assume there are hardwarechanges which make the old firmwares incompatible with your inverter. The fan issues where addressed by the F2 version for the 067 hardware base. I would recommend to report it to your local growatt support maybe they also have a firmware in place for the newer HW model as this is and was a common issue with most of the 067 inverters. So for now no recommendation to flash 067/068 firmwares on your machine...