Thanks for the reply, I've just done some digging & found some firmware, (I kept the manual so know it's marketed as an OTT MXQ box which helps), but they all have an earlier date than the one listed on the recovery screen (it shows 20160303), & my previous experience with Android phones tells me that may be an issue as they dont like overwriting newer firmwares. I'll try it anyway when ity finishes downloading. Fingers crossed!
Nope, no joy. Searched high & low but cannot find the same date firmware or a later one than 20160303 so it won't install. Guess I have a paperweight now unless there's something more extreme I can try.