`OSError: no SD card` or `OSError: timeout waiting for v2 card` with official Raspberry Pi SD cards

The current version of the MicroPython SD card library (`sdcard.py`) doesn't always seem to play super nicely with the official Raspberry Pi SD cards.

If you're having trouble, try using the updated library from this PR instead - you'll need to save it to your Presto as `sdcard.py` for it to be used instead of the built-in one:

https://github.com/micropython/micropython-lib/pull/765