3GS 3.1.2 Stuck in DFU mode

[crimson_idol]

Hi,

I have an iPhone 3GS 3.1.2:

Baseband: 05.11.07
iBoot: iBoot-359.3.2
Week: 42
MC Model

I tried restoring with a custom 3.1.2 firmware and the restore went through but at the end it didn't boot.
Before restoring I tried saving SHSH with Cydia but as I tried this yesterday, I guess I don't have SHSH for 3.1.2 on file. I only have 3.1.3 SHSH stored.
I don't want to upgrade to 3.1.3 but my device is stuck in DFU mode. I've tried 10 seconds methods for getting out of DFU but no luck.
I tried iRecovery but it doesn't detect the device.
iTunes detects iPhone in recovery (DFU) mode but I cannot restore with original FWs and when I try restoring with custom firmwares, I get 1600 error.
Blackra1n does not detect the device.
redsn0w does not detect the device.

Is there a way to get out of DFU mode or restore with 3.1.2? I don't want to upgrade to 3.1.3.

[dhamien]

Custom firmwares don't work for phone with iBoot 359.3.2 so unfortunately you messed up your phone. I'm afraid there's nothing to do but restore it to 3.1.3