Supported Basebands :
1.0.11, 1.0.13, 1.0.14, 2.0.10, 2.0.12, 3.0.04, 3.4.01, 3.4.02, 3.4.03, 5.0.00, 5.0.02, 5.2.00
Supported Firmware Versions:
5.0, 5.0.1, 5.1, 5.1.1, 6.0 , 6.0.1, 6.1, 6.1.1, 6.1.2, 6.1.3, 7.0, 7.0.2, 7.0.3, 7.0.4, 7.0.6, 7.1, 7.1.1, 7.1.2
And All Other Firmwares & Basebands Of iPhone 4s Are supported !