3GS 3.1.2 with 5.11.07 baseband / Unlock Problem

[driverm]

Hi

I have a 3GS with a custom firmware 3.1.2 that I have created with pwnage. My baseband is 5.11.07 and I have an old bootrom.

the problem is that I cannot unlock my iphone. As far as I know, the only unlock software for 5.11.07 baseband is blacksn0w. So, I tried;

1) install blacksn0w through Cydia by adding "blackra1n.com" to sources
Result: iphone booted itself, stock at apple logo
2) install blacksn0w through Cydia by adding "cydia.pushfix.info" to sources
Result: iphone booted itself, stock at apple logo
3) install blacksn0w manually by adding "blacksn0w.dylib" and "com.apple.CommCenter.plist" to specified places.
Result : iphone booted itself, stock at apple logo

So, I tried my best to unlock it but all I got was an iphone that stuck at apple logo and booting itself continuously. Btw, before I was installed custom firmware that was created by pwnage, I was using blackra1n and blacksn0w but it crashed and stuck at apple logo suddenly so I had to use pwnage for installing a new custom firmware.

I need my iphone ALOT. Please help me with this issue. Thank you soo much