Hmm so they don’t actually explain how to change the UID… I’d ask the vendor specifically. There might be a script or a specific command you need to run to change it. Otherwise you could just try writing to the required memory pages 00 and 01… ultralight tags have 4 byte memory pages and the UID is split across page 00 and 01 with a BUF byte. Try reading your room key with taginfo on your phone and post the full scan to see what I’m talking about.
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