Apple has released iOS 8.1.1 with patched pangu8 jailbreak. Restore your idevice to jaibreakable iOS 8.1, before Apple stop signing iOS 8.1
Tag: how to restore to ios 8.1
This is the way to update your idevice to iOS 8.1 with Pangu8 jailbreak compatible. Also this method avoid wasting your device memory.