Is that OK to rewrite the data on the NFC Card from MFRC-522 RFID NFC Reader ?
No. It's for ADVANCED user Only!
But if you trying to change the data on the tag/card (At your own risk). The data on the card if it is accidentally erased you cannot get back the default settings (Manufacture's setting).
Tags: MFRC-522 RFID NFC Reader