Hey Guys, first of all i've an iPhone 6 on 8.1 and the same cydia packages installed as hotsjf.
Touch ID was working too. Then i've installed appcake (only this) from cydia.iphonecake.com (latest version 4.82). cydia is up to date!
Then i have sent GTA:SA over SSH to Appcake/Imported and installed over the App successfully.
Played some minutes and tried to reboot.
And what i have got is a endless boot and no chance to boot in safe mode (volume up).