Update README.md
Co-authored-by: Andrew Scheller <andrew.scheller@raspberrypi.com>
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`picotool info` again will unlock it properly the next time (or you can reboot the device).
### Zadig
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To communicate with RP2040 in BOOTSEL mode on Windows, you will need to install a driver. To do this, download and run [Zadig](http://zadig.akeo.ie), select `RP2 Boot (Interface 1)` from the dropdown box and select `WinUSB` as the driver, and click on the "Install Driver" button. Wait for the installation to complete - this may take a few minutes.
This is only required for RP2040.
