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Fit3 Flasher
AppTransfer matching Fit3 firmware from a browser
Fit3 Flasher sends stock or modified AZA3 packages through Bluetooth serial in a desktop browser. It checks package integrity and separates transfer from installation.
The band must already run R390XXU0AZA3, matching the package target. Incorrect firmware can erase data or disable the band; recovery is not established for every failure.
- Add wrist controls and apps
- Package integrity checks
- Optional transfer readback
- Matching-version stock firmware transfer
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