flash_usb: Wait for busnum file to exist when flashing with picoboot #6690
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This solves an issue where the USB directory could exist, but the busnum file itself may not exist immediately. This was encountered when flashing a Pico connected to a Raspberry Pi 5. Signed-off-by: Jack Wakefield <jackwakefield@protonmail.com>
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This solves an issue where the USB directory could exist, but the busnum file itself may not exist immediately. This was encountered when flashing a Pico connected to a Raspberry Pi 5.