If box only flashes to L097 then try a later f/w or if on latest then retreat to earliest and start working thru until a f/w finally loads to L100.
In Mr Davies case --- plug the null cable in the top RS232 port on back of PC--then into box, find a f/w then press next, power up box and see if done appears. If not then retry with different firmware or check box is original or clone and also ensure you are using correct upgrade tool [file in posts above]
Reaper