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if your asking me if i want a custom firmware made by you i appreciate the gesture but i dont unlock my iphone any more im staying with at&t bc i like being able to use the 3g speed vs edge speed that tmobile can only provide for unlocked iphones. but thats any way.
Here is custom firmware (not activated) for iphone 4.
Use Redsn0w to put your phone into pwn'd DFU mode before doing a shift restore.
If you need a custom firmware which is activated then let me know and I'll create one tonight...