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[BUG] Galaxy Buds 2 Pro firmware downgrade fails: progress completes but earbuds disconnect and revert to latest firmware #677

@Zakariaboudelaa

Description

@Zakariaboudelaa

Describe the bug
Attempting to downgrade Galaxy Buds 2 Pro firmware using GalaxyBudsClient always fails at the final stage.
The firmware transfer completes (progress reaches 100%), but the earbuds disconnect/reboot and remain on the latest firmware version. No explicit error is shown in the application.

To Reproduce
Steps to reproduce the behavior:

Pair Galaxy Buds 2 Pro with the PC via Bluetooth

Open GalaxyBudsClient

Load an older official Samsung firmware for Galaxy Buds 2 Pro

Start the firmware downgrade process

Wait until progress reaches 100%

Earbuds disconnect/reboot automatically

Reconnect earbuds and check firmware version

Expected behavior
The earbuds should successfully install the selected older firmware version and report the downgraded firmware after reboot.

Actual behavior
The progress bar reaches 100%, but the earbuds disconnect at the final commit stage and reboot.
After reconnecting, the firmware version is unchanged and remains the latest version.

Additional context
Issue occurs consistently with Galaxy Buds 2 Pro on the latest firmware

Same behavior observed when attempting downgrade via Android (progress completes but firmware does not change)

On Windows 11, earbuds often disconnect during or immediately after the final flashing stage

This may indicate firmware-level anti-rollback protection silently rejecting the downgrade while the client reports a successful transfer

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