Actually this could be something else. I believe the Pico you have is one of the first batch that were made 6 years ago (it has a sticker on the STM32, subsequent ones didn't).
Something changed in the Windows 10 OS drivers, and I believe it meant that the Pico's bootloader no longer got detected in Windows 10 properly (or maybe w10 does treat it as a modem?), even though the Pico itself works fine when booting normally.
So you have two options:
'Advanced Reflash' is a bit more of a faff, but it should fix your Pico for good, and you can then easily update with the IDE from Windows 10 from then on.
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