There is a ton of discussion about this cloner. search the forums for “blue cloner”
TL;DR is if you aren’t super careful and know what you are doing, it’s easy to brick your xEM.
Read this
And know all blue cloners are not created equal. Quality varies quite a bit and most of them won’t clone HID cards.
You are better off with a Proxmark3 RDV4 and ProxLF antenna
https://dangerousthings.com/product/proxlf/
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