iOS 9 jailbreak
How to fix ‘Error occurred in preparing the environment, Err Code (51)’ while jailbreaking iOS 9.1 betaPangu

Several users trying to jailbreak iOS 9.1 beta untethered have reported encountering the Error code 51 as the jailbreak process gets stuck around the 65% mark. The error code description states: "Error occurred in preparing the environment".

It is ascertained that the error occurs due to coding incompatibility issues between the Pangu 9 jailbreak and iOS 9.1 Beta, as the tool was built to support iOS 9 through iOS 9.0.2 versions only. However, folks at Redmond Pie have shared a simple fix to get rid of this error.

iOS 9 jailbreak
How to fix ‘Error occurred in preparing the environment, Err Code (51)’ with Pangu iOS 9 jailbreakRedmond Pie

How to fix 'Error occurred in preparing the environment, Err Code (51)' during iOS 9 jailbreak

Step 1: Ensure you have synced all your data files via iCloud or iTunes or locally through your computer. However, a full data backup will not help in this situation as backups created with newer iOS versions (iOS 9.1) cannot be used to restore to an earlier version (iOS 9 through iOS 9.0.2).

Step 2: If you are trying to jailbreak the iOS 9.1 public beta build, then you have to remove the beta profile via Settings > General > Profile.

Step 3: Reset all the settings by going to Settings > General > Reset and select Reset all Settings.

Step 4: Download the latest version of iOS (9.0.2) to your computer and perform a clean install on your iOS device, using our step-by-step guide posted here.

Step 5: Download the latest version of Pangu 9 and then jailbreak your device by following the step-by-step instructions outlined in our guide posted here.

Step 6: That's it. Your iOS device should now be jailbroken without any hassles.

[Source: Redmond Pie]