Download NFC Shell (https://play.google.com/store/apps/details?id=com.emutag.nfcshell) and paste the whole list of A2 (write) commands from this thread. This is a rescue operation type thing so don’t mess with NFC Shell in the future unless you know what’s happening. In this case it will send the command “write zeros for every byte” to every page in the user memory of sector 0. You should be able to just paste that whole block into NFC Shell, but if it’s gives you trouble you can break it up into smaller chunks.
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