Check the 3.6-volt battery. if it's dead you lost you lost all firmware
If it's good, get a hairdryer, and look for where all the heat sinks are, one of the caps next to a heat sink lost its value it's dried up by heating it up the receiver will work again, you may have to reboot, your time will only be a minute or two, then death again but it will tell which cap is the bad one, if it keeps running get a can of cold spray or canned air upside down and hit that cap near a heat sink I bet the receiver goes dead again this is a old trick I used 100's of times that works