You can install without fear.
Early last week Apple released watchOS 5.1 — new firmware for the Apple Watch, which supports group calls on FaceTime and new dials. The update has been extremely successful — installation failed on many Apple Watch, which smart watch stopped working. Today Apple released IOS 5.1.1 watchOS, which fixes this problem.
It is important to note that those Apple Watch users who are faced with failure when setting the watch OS 5.1 will not be able to return your smart watch to life by installing watchOS 5.1.1. Defective Apple Watch can repair only Apple. Their users need to contact the service centers of companies.
For all other users, watchOS 5.1.1 recommended to install. The update introduces the ability to perform group calls on FaceTime, new watch faces, support for 70 new emoticons, and also carried out work to optimize and increase stability.