OTA firmware upload: OPERATION FAILED (keeps disconnecting)

Trying to update Ganglion firmware from 2.0.1 to 3.0.2, following https://docs.openbci.com/Ganglion/GanglionProgram/ using Android 13.

1) I bond with the board using nRF Connect,
2) I initiate upload in the firmware update tool.
3) the device disconnects in nRF Connect and I get a mysterious "OPERATION FAILED" in the firmware update tool UI.

I'm not sure how to debug this or what steps to take.

Below is a gif that shows the error

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