2G: No signal & Restore needed message

[kacheng]

Hi,

every time before the upgrades, jailbreaks and unlocks worked smoothly.
However, this time after upgrading my 2G from 3.1.2 to 3.1.3 something must have gone wrong. Basically what I did was:
I restored to 3.1.3, jailbreaked with redsn0w 0.9.4 but used the 3.1.2 ipsw.

But now I always get the "Restore needed. Iphone cannot make or receive calls.." msg and the display also shows "no signal". Some times I have signal for a little while but only until the next call or data transfer.
As it hasn't fallen down since I would exclude a hardware defect.
My baseband is 04.05.04_G.

I already tried a couple of times going back to 3.1.2 and 3.1.3, also with custom made 3.1.2(3) by the pawnage tool - but still get the same result: "restore needed"-msg and no signal. Also no other SIM card helped.

I am working with iTunes 10.1, is that it?

Who can help? Is it bricked?

[Simon]

Sounds like a hardware issue to me. Or your baseband is corrupt. Either way if a restore isnt fixing it there isnt much you can do.

[kacheng]

As said it was running alright with 3.1.2 but some apps crashed so I decided to set it up new.
Can I downgrade/upgrade the baseband?
Would be too bad if there's nothing that can be done. I really like the 2G.

[Simon]

A dfu restore should refresh the baseband so if that doesn't fix it then it is a hardware issue. Every phone I have seen pop up with that message I have not been able to fix.

[kacheng]

But how can it be that it was totally fine before I tried to upgrade to 3.1.3?

[Simon]

Don't know. Maybe something happened during the update that caused your baseband to get corrupted.

[kacheng]

Don't know. Maybe something happened during the update that caused your baseband to get corrupted.

Does there maybe help a log file (from BossPrefs) to identify the problem?

Thanks for your help btw.

[Simon]

Not too sure sorry