The latest and second-latest generations of the Xiaomi Mi Band have proven very popular as wearables. However, they have had 1 or 2 slight deficiencies, such as the inability to act as a trusted device for a user's laptop without a third-party app. The OEM has addressed this in a new firmware update.
The new feature is compatible with Windows PCs, and is only available in the the Indian market for now. The software also incorporates a Mi Fit app update. It allows the Bands to sign in using Apple ID credentials for the first time. The update also comes with applicable bug-fixes for the 2 devices.
The new app update is called Mi Fit App version 4.0.17. It is required to install the new firmware update (v1.0.9.42) on the Mi Band 3 or 4. It continues a decent history of software upgrades for these 2 fitness trackers. However, there is no sign of a similar update for the new 3i variant.