It seems that Apple smartphones have a problem with the latest technology. New iPhone users complain that they received an Ultra Wideband Update Failed error after updating iOS 13.1.3 and iOS 13.2 beta 3.
In particular, it does not allow sending files via AirDrop, as it belongs to the latest U1 chip, which is responsible for the operation of new Apple smartphones in the format of ultra-wideband communication (UWB).
So far, the causes of the problem have not been determined, but Apple is changing such smartphones under warranty. At the same time, some users managed to solve the problem on their own by restoring the firmware from the backup. But for some reason, this method does not work for everyone, and some pattern has not yet been discovered.