The ih8sn0w team has released Sn0wbreeze v2.9.11 which includes support to jailbreak iOS 6.1.2 for A4 Devices and iPhone 3GS. The latest Sn0wbreeze also integrated with Apple TV 2 iOS 5.2 sandbox fix and fixes for Cydia having “compatibility-issues” with the unteather package on 6.1.2.
Download Sn0wbreeze v2.9.11 for Windows
See also:
iOS 6.1.2 for iPhone, iPod Touch and iPad
Jailbreak iOS 6.1.2 with Evasi0n 1.4