Situation:
5K750XXXXXX OTB 1.1.2
1.1.2 Restore->1.1.1 Upgrade->1.1.2 jailbreak
Use Turbosim perfect
What I did:
I did install most kind of third party soft which list on installer and community resource, include phone book sim reader, summerboard etc..
I did change the carrier logo, it was great.
after few days, BRICK!
No signal with a conversation "Repair Needed iPhone cannot make and receive calls http://www.apple.com/support"
It's unable to restore the phone again.
I tried to Shift+1.1.1 error 1002 (not error 1015 as normal)
I tried to Shift+1.1.2 after 30-40 minutes waiting time then IT says unable to restore iPhone.
Check *3001#12345#* -->FW Version->Blank!! nothing in there! (Normal should be 04_02_13G)
HELP MASTER....
Extremely Appreciate that!

UP AND UP.
crying....
CANNOT USE phone function.
SOS......

Are you in restore or DFU mode when you're trying to restore back to 1.1.1?

try DFU mode to restore it back to 1.1.1 and see if that fixes your problem.

Originally Posted by TeckniX

Are you in restore or DFU mode when you're trying to restore back to 1.1.1?

try DFU mode to restore it back to 1.1.1 and see if that fixes your problem.

What is DFU mode???
I was using Power+Home 10sec mode.
cable connecting to IT happened

yeah try to do more like 25+secs when in dfu the phone stays with a black screen, you don't see it power up asking you to connect to iTunes.
itunes will detect the phone in recovery, but the iPhone screen will stay off.

Do a search on DFU, if you can't get it to work correctly.