Here is a general for firmware v1.0.9.66, along with what to look for:
The was a notable update primarily for the Xiaomi Mi Band 4 firmware v1.0.9.66
Looking at community forums (Reddit/Netgear Community) regarding v1.0.9.66: Here is a general for firmware v1
Since I cannot access a specific device on your desk, this review is based on the typical release history, changelogs, and user community feedback associated with firmware version . firmware v1.0.9.66