At least my other 2 units are working reasonably well (although they're now hashing at around 220 GH/s - consistently. Well below what was promised.)
So if you have 2 "other units" (I suggest you have tho S3s working normally, right?) why don't try to clone the SD card content from normal S3 to SD card of S1's controller? Maybe it will work? 
That's the kind of thing I'm thinking of, but not sure of the procedure to do that. I'm not put off by a challenge, just don't know where to start..