Problem unlocking iPhone 3gs on iOS6?

I'm trying to unlock my iphone 3gs on iOS6. I already installed ultrasn0w then I tried to install 'ultrasn0w fixer for iOS6' but I'm having problems adding the repo: http://cydia.iparelhos.com. I'm getting this error:
Sub-process gzip returned an error code (1)

Failed to fetch
http://repo.iparelhos.com/./Packages.gz Sub-process gzip returned and error code (1)
Is there an alternate way for this

Ultrasnwow only works on certain baseband, if you updated to UPS 6.0 or 6.0.1, and didn't preserve the old baseband, then Ultrasnwow just won't work.

Get it factory unlocked and forget about these hassles forever. It's a permanent unlock and your phone won't lock back. You can mail this person (arghyle@rocketmail.com) who can help you get the phone unlocked.

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