XIAO ESP32-S3 SENSE: can't get back into UF2 bootloader

[bikeNomad]

CircuitPython version and board name

Adafruit CircuitPython 10.1.0-beta.1-2-gf6f52ade4c-dirty on 2025-11-20; Seeed Xiao ESP32-S3 Sense with ESP32S3

Code/REPL

import microcontroller
microcontroller.on_next_reset(microcontroller.RunMode.BOOTLOADER)
mmicrocontroller.reset()

Behavior

The board goes right back to the CircuitPython REPL (with CIRCUITPY mounted).

Also, I can't get into the bootloader using the RESET switch (tried with various delays, waiting for yellow LED, etc.).

Description

I initially programmed the board with the UF2 bootloader (built and then did make flash). This presented the XIAO BOOT drive, which I then copied the built UF2 into. After reset, CircuitPython behaved normally except I wasn't able to get back into the bootloader (either programmatically with the above code or by using the RESET button).

Additional information

No response

[anecdata]

Does it make any difference to use microcontroller.on_next_reset(microcontroller.RunMode.UF2)?