Dunno if this will help, but came across a similar issue with "Wrong Signature" message when installing a newer firmware via USB stick on a MAG254 and it turned out to be the USB stick. For whatever reason, changed the stick and it worked. Also ran into a "unsupported architecture" message and discovered the imageupdate file was actually for a MAG250. Verified by opening up the imageupdate file using "EditPad Lite" and looking at the STB Model:MAG254 string. Got the right public FW and all went well.
Posts by hubble998
