Its pretty amazing how repetitive this thread has become... I arrived here because I was in EXACTLY the same position, with TWO F5 boxes, one stuck on LOAD and one with the dim led/"8" symptoms...
Now without trying to blow my own trumpet, I'm pretty tech-savvy, but I was almost smashing up my boxes AND my computer 'cos I couldn't get past the "STB error" screen!
If Reaper offers you the chance to help, f**king take it! He resurrected BOTH boxes for me, and all he asked for was for you to cover any postage costs. (I'll admit, I paid him a little extra to buy himself a drink, but I was genuinely moved by the fact that he donated the extra money to an amazing charity!)
I know many people (myself included), would be dubious about sending their "golden goose" to somebody that seems to be "too good to be true", but like I said to the wife: "I'm gonna bin this f**king paperweight!", so sent the first box away, and less than 36 hours later, I had an email saying the box was up and running and on its way back! (He even explained all the technical/geeky stuff to me, and that deserved another 'hat tip'!). Second box was was sent away shortly after lol.
If it wasnt for this forum - or Reaper - I would be binning two boxes and spending money on another box. So I'm sorry for the lengthy post, but honestly: all the instructions you're looking for are in this thread... all the files you're looking for, are in this thread... but if you still fail (like me), and Reaper offers his help, what the f**k are you waiting for??? (I've just turned 40, and like the wife told me, "life's too short to be wondering about what the f*** a null modem cable is!!" lmfao
So true, though!