@b1230 I found the same issue and also posted it. This firmware file is for the V1 hardware. I tried it both from my PC and Mac.

I downloaded the latest firmware for the Deco M9 Plus with V2 Hardware and the firmware file that is available, has the filename M9Plus 1.0_en_1.4.2 Build 20200821 Rel. 44341_up.bin This appears to...