The release notes for the new V20.0.1 update only address the Switch’s boot-up bug, so it’s not essential for anyone without problems installing V20.0.0. The release says: “Fixed an issue where Error Code: 2206-1015 sometimes occurred when restarting the system after updating to system version 20.0.0.”

If your Switch is crashing following an update to version 20.0.0, you're not alone. Luckily, Nintendo is out with a patch.

To install Version 20.0.1 and resolve the error code on Nintendo Switch, you must enter maintenance mode. The first step is to ensure the Nintendo Switch is turned off. If the console will not turn off, hold down the Power Button for at least 12 seconds to force it to shut down.