This is why, if you've not checked, it's so easy to kill your handset.
The CPU on your phone has it's own OTP memory (OTP - One Time Programmable) which holds chip data, manufacturer data, Security data and any corruption to ANY of those bits of data can render the unit dead, especially Security, seeing as you were S-OFF you were free to write to any and all partitions but (and this is a big 'but') using software not written for this device increases the risk of it bricking, essentially the data you wrote in was 100% wrong unfortunately.
Bashing away at my HTC Desire C