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Snappy is a command line tool for manipulating APFS snapshots on applicable *OS versions.

If you are on tvOS 11 and want to perform an OTA update on a device that is currently jailbroken you will need to revert to the original snapshot before continuing.

Reverting to original pre-jailbroken filesystem

1. Install Snappy (com.bingner.snappy)
2. SSH in to your Device (ssh root@DEVICE_IP)
2. snappy -o
3. reboot

You may need to unblock updates a few other ways if you have installed any kind of profiles to block them (ie watch os beta profile)