The Pangu Team has just released an update to their iOS 8.x untethered jailbreak. Users who are already jailbroken can venture into the Pangu can update.
The update fixes include Cydia Substrate loading issue upon reboot, iMessage bugs on picture sending, and Safari crashes. It is advised that the jailbroken users can update this app now.
Its recommended that you do not set a passcode on your jailbroken device due to boot loop issues that many are incurring. This issue is being worked on as well.
To update, launch the Pangu app, which should be located on your Home screen and tap the Manager tab at the bottom of the screen. There, under the update tab, you should see the Pangu 8.0-8.1.x Untether update. Tap the download (arrow) button to install the update.
After tapping the update button, the new untether .deb file will download, and youll be prompted to reboot your device to install the update untether.
For more on how to jailbreak you iOS 8.x device read this one.