If you want to keep the possibilty to flash custom software on your watch, DO NOT UPGRADE TO THESE VERSIONS. You will not be able to flash any other firmware afterwards.
PACEfied firmware is safe, and does NOT lock your bootloader.
We have heard several times now via inofficial sources that Huami is working on an official bootloader unlocking service. So far, we, however, have no official information here.
On the other hand, Olivier (french developer on xda) has spent a significant amount of time to understand the unlocking process and we have succeeded to successfully unlock two watches. We are currently in the process of setting up a (free) unlocking web service, allowing individual xda users to unlock their watches for private usage (and accepting loss of warranty from Huami).
In case, Huami may ever come out with their service, we will stop our service, as we do not want to compete with Huami here, just filling the gap if Huami doesn't move forward with their unlocking service.
Please give us some time (we expect 2-3 weeks) to setup the unlock service.
The unlock service is live now. Head over to https://forum.xda-developers.com/sma...-void-t3654011, if you want your bootloader unlocked!