As others have mentioned the obvious place to check is the internal SD card which holds the firmware bin file. When we added Micro Swiss All-Metal Hotends to our Dreamers we had to roll back the firmware to allow the machines to heat to 260 so I’m sure the internal SD card is accessible to the end user. Flip the machine on it’s back and remove the bottom panel. You should then see a metal clasp holding the micro SD card. Remove it, check contacts, then reinstall ensuring the card is seated properly. Before putting the bottom panel back on turn the machine on, heat it up and start a print to check if your issue is resolved.
If this doesn’t fix the issue it could be a problem with the main board, however that’s something you’d have to contact Flashforge about. Good luck resolving your issue!
-Joe, Operations Director, Access 3D Services