How to update the app. I see no provision to update the app so I can update the AC300 unit.

You have to be logged in with a Bluetti account to be able to update your AC300’s firmware via Bluetooth - it won’t have the firmware update option if you use Offline mode or if you’re not within the Bluetooth range.

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Update the app via the Google Play store (Android) or Apple App Store (iOS)
Open the app, log in to your Bluetti account
Disconnect your AC300 via WiFi (Firmware update does not work via WiFi)
Connect your AC300 via bluetooth
Update the AC300 firmware