The procedure is not simple and prior iOS components/firmware modification knowledge is strongly advised.
All errors that usually occur are documented in the F.A.Q. This method requires the iOS version to be signed so you can't use it after the iOS version was dropped by Apple (usually after a new version is being rolled). Please read the description carefully and watch the entire video to prevent bricking the device or for a better understanding of the process! Please keep in mind that this method is under development and might not be compatible with all iPhone 5S models or revisions, it is subjected to changes, additions and modifications as per research conclusions. Today, as I promised here is the tutorial for CFW (Custom Firmware) for iOS 10.1.1 iPhone 5S.
