Apple Firmware which are still signing

[google]

My current ATV2 is on 4.4.4 jailbroken. What firmware can I upgrade to that is still jailbreakable and being signed by Apple? For some reason IOS 7 airplay does not work anymore nor does Netflix on 4.4.4

 

[grockk]

List of iOS firmwares and which are being signed.

http://www.icj.me/ios/all#AppleTV21