Datasheet

such as Blink, following the directions in the Arduino (https://adafru.it/C3t) section of this guide.

3. Uninstall when CIRCUITPY is visible as a drive, if you have CircuitPython installed on the board.

Each time you'll see an entry in the Device Manager similar to the above, with slightly different wording, and a different

COM port. Uninstall the device as shown above.

If you are pressed for time, number 1. is the most important driver to uninstall.

After you uninstall each device, you can unplug and plug the board in again, and it will reinstall, using a built-in

Windows driver, instead of the incorrect one. Double-click the reset button to get CPLAYBOOT and reinstall that as

well. The new devices will show up in Device Manager as "USB Serial Device (COMxx)" instead of "Adafruit Circuit

Playground", similar to the image below:

If this does not solve the problem of CPLAYBOOT not appearing and the ARM7TDMI error, please post in

https://learn.adafruit.com (https://adafru.it/id3)and let us know.