I had my phone 3.1.2 jailbroken but after trying to reset my network settings I got an Apple logo loop, so I just went and restored it without checking to see if it could be fixed. Now I have 3.1.3 and want to check my bootrom to see if I can jailbreak again. The third, fourth, and fifth serial numbers are 932, but I want to make sure. I'm just wondering, with a name like DFU (I've never used this mode before, only Recovery), will it force me to upgrade to 4.0 since it's been officially released? Or should I not even bother and just wait until 4.0 jailbreaks for the 3G S roll around?