WATCH is the operating system developed by the Apple company especially for the Apple Watch, it has already been updated once by those from Cupertino, while Watch 2.0 it will be released in the fall.
In Watch 1.0.1 the Apple company changed the way the sensor that monitors the heartbeat on the Apple Watch works, and many people were dissatisfied with this change, so they tried to downgrade to the previous version of watchOS.
Because the Apple Watch does not have a DFU Mode, many users were left with locked watches without the possibility of restoring them, so they decided to visit Apple Stores to solve their problems, but the Apple company asked them for money to help them.
Normally, iDevices/Macs that are in such a situation benefit from a free solution to the problem because a restore can be performed on the spot by an Apple employee, but in the case of the Apple Watch things are not so simple .
Reinstalling watchOS in an Apple Watch that has been locked in recovery mode most likely requires special software that Apple has, so that's where the costs of sending the watches to Apple services to reinstall the operating system come from. .
Apple employees in the Apple Store would have been instructed to send all Apple Watches with problems to repair centers and in most cases charge repair fees outside the warranty, so some users turned out to be unlucky.
Just like in the case of iDevices/Macs, Apple does not allow the downgrading of watchOS from its watches, nor will it.
