Being here, reading this article, you are very close to acquire the knowledge on how to jailbreak a device running iOS 8, for your favorite tweaks and new experiments.
Same development team that released last year a similar tool for iOS 8 is now back with a new tool for iOS 8 devices this time. The new toll function on iOS 8.0 up to 8.1.2
Jailbreaking you device may be dangerous, because altering the official software can cause malfunctioning or features becoming unavailable. Jailbreaking is on you own risk anything that happens is on your responsibility. But, you have always a chance to restore your device at the state before you jailbreak it.
Similar with the previous tool, you need to download the Pangu 8 application on a Windows or Mac machine (no Linux this time), with the iOS device connected.
A backup of your device is recommended, before everything else. Use iCloud or iTunes backup tools.. iTunes offer encrypting (note the password you use, just in case !). Backup encryption speeds up the whole process and allows storing the passwords in the same time, so there is no more need to key them in when signing up on your services (emails or so) and applications that you run on your device. (iCloud handles backups this ways, with the need to key in passwords)
When backup ends, disable the passcodes and download Pangu jailbbreak tool, click on it to install it on your device and run it.
If messages about ‘untrusted developer’ show up during installation (on OS X ) ignore them or open the application with right click.
Continue installation following the prompts. Connect the iOS device; activate the jailbreak icon on the Windows or Max machine, and wait, while the application transfers all needed file onto to iOS device. This is the longest part. Do not tap on the Pangu icon before the process ends.
Finally, the Cydia application is installed, and you can enjoy tweaking your device.
For rollback, if errors or you just decide that you do not need jailbreaking anymore, just restore your device from the backup you just made. The Pangu 8 troubleshooting guide is available if something goes wrong during the installation or operation.