After hours of research, I found the solution: reflash with the latest firmware as of today.
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reset flash memory w/ flash_nuke.uf2
https://www.raspberrypi.com/documentation/microcontrollers/pico-series.html#resetting-flash-memory -
flash w/ Sparkfun…UF2 aka micropython for XRP
MicroPython - Python for microcontrollers -
run xrpcode.wpi.edu . it automatically updates XRP lib to 2.0.1 by copying files into 2 new directories…
end result:
MicroPython v1.25.0-preview.402.g274c8c419 on 2025-03-25; SparkFun XRP Controller with RP2350
test file works !!!