Strange 3GS issue when unlocking

Hi all,

I have been a lurker on here for a long time but have never had the need to post until now. I am having a really weird problem with my 3GS and haven't been able to find any solutions on any forums. I have posted this problem on another forum but no one seems to know the answer

I am on T-mobile UK and have a 3GS running 3.1.2 & baseband 5.11.

On Thursday, I was out and about when the phone ran out of signal. I switched airplane mode on as I usually do when my signal drops out. The phone crashed and switched off and has been displaying the white apple logo screen, switching itself on & off randomly and getting quite warm. When I got home, I put it into restore mode and tried to restore with itunes. When I alt+clicked and chose the firmware (3.1.2) I had used before, I got the error message saying something like the device isn't eligible for the requested build. So I tried a different custom firmware and it worked fine.

Then I tried to jb with blackra1n via my computer (as usual). The process seemed to work fine but no logo appeared on the springboard, however I could install my apps so I assume the jailbreak worked. I went via cydia to unlock with blacksn0w through there and after I had run this, the phone slowed right down and just said "searching" in the signal bar area. So I tried airplane mode again and.... the phone crashed AGAIN. I have tried this three times and every time the same thing happens. I have a feeling its something to do with an update in Cydia...?

Does anyone have any ideas what I can try next? I have my SHSH stored on Cydia but I don't really know if this will help. I am thinking if I can get blackra1n installed okay on the phone I will be able to unlock with no problems but I'm not sure what to try next.

Any help would be GREATLY appreciated

 

Aah, amazing! I have managed to fix it now using the solution on that site, thank you so much!