The Below are the official Apple TV Direct Download links to all iOS Firmware for Apple TV. You can download your specific Apple TV Firmware from here;
Complete List of All iOS for Apple TV, 2 and 3 to Download
Download iOS 4.1.0: AppleTV2,1_4.1_8M89_Restore.ipsw
Download iOS 4.2.0 : AppleTV2,1_4.2_8C150_Restore.ipsw
Download iOS 4.2.1: AppleTV2,1_4.2.1_8C154_Restore.ipsw
Download iOS 4.3.0: AppleTV2,1_4.3_8F191m_Restore.ipsw
Download iOS 4.3.0 (Build 8F202): AppleTV2,1_4.3_8F202_Restore.ipsw
Download iOS 4.3.0 (Build 8F305): AppleTV2,1_4.3_8F305_Restore.ipsw
Download iOS 4.3.0 (Build 8F455): AppleTV2,1_4.3_8F455_Restore.ipsw
Download iOS 4.4.0: AppleTV2,1_4.4_9A334v_Restore.ipsw
Download iOS 4.4.1: AppleTV2,1_4.4.1_9A335a_Restore.ipsw
Download iOS 4.4.2: AppleTV2,1_4.4.2_9A336a_Restore.ipsw
Download iOS 4.4.3: AppleTV2,1_4.4.3_9A405l_Restore.ipsw
Download iOS 4.4.4: AppleTV2,1_4.4.4_9A406a_Restore.ipsw
Download iOS 5.0.0 (ATV 2): AppleTV2,1_5.0_9B179b_Restore.ipsw
Download iOS 5.0.0 (ATV 3): AppleTV3,1_5.0_9B179b_Restore.ipsw
Download iOS 5.0.0 (ATV 2): AppleTV2,1_5.0_9B206f_Restore.ipsw
Download iOS 5.0.0 (ATV 3): AppleTV3,1_5.0_9B206f_Restore.ipsw
Download iOS 5.0.2 (ATV 2): AppleTV2,1_5.0.2_9B830_Restore.ipsw
Download iOS 5.0.2 (ATV 3): AppleTV3,1_5.0.2_9B830_Restore.ipsw
Download iOS 5.1.0 (ATV 2): AppleTV2,1_5.1_10A406e_Restore.ipsw
Download iOS 5.1.0 (ATV 3): AppleTV3,1_5.1_10A406e_Restore.ipsw
Download iOS 5.1.1 (ATV 2): AppleTV2,1_5.1.1_10A831_Restore.ipsw
Download iOS 5.1.1 (ATV 3): AppleTV3,1_5.1.1_10A831_Restore.ipsw
Download iOS 5.2.0 (ATV 2):AppleTV2,1_5.2_10B144b_Restore.ipsw
Download iOS 5.2.0 (ATV 3):AppleTV3,1_5.2_10B144b_Restore.ipsw
Download iOS 5.2.0 (ATV 3 New): AppleTV3,2_5.2_10B144b_Restore.ipsw
Download iOS 5.2.1 (ATV 2): AppleTV2,1_5.2.1_10B329a_Restore.ipsw
Download iOS 5.2.1 (ATV 3): AppleTV3,1_5.2.1_10B329a_Restore.ipsw
Download iOS 5.2.1 (ATV 3 New): AppleTV3,2_5.2.1_10B329a_Restore.ipsw
