Uploaded github and need to unistall

hi, i messed up and download this github. supposedly it was some kind of hotfix. see below. Is there a way for me to install it or remove it? anyway someone can check the code to see if its bad? any help is appreciated

Try re-flash your mSD card with latest umbrel OS.
User data is safe, is stored on SSD, on mSD is only the OS.

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