This is OFFICIAL firmware right from Snapmaker HQ Support below! I've been having "Toolhead Swapping Anomaly" issues with my Snapmaker U1 and their support sent me this Firmware after reaching out and it resolved my issue.
Use at your own discretion. Reach out to Snapmaker if you have any post firmware install issues. Their support is great.
Official Snapmaker Support Link for firmware 1.2.0
https://bit.ly/4bXU06H
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