It is possible to write ndef data to a Mifare “classic” chip but it’s not NFC compliant… phone and NFC devices won’t read it unless they have an NXP reader chip with attached crypto1 license necessary to read the Mifare classic memory structure. NXP calls this the “NFC Type Mifare”… but it’s a bullshit move and not actually NFC forum compliant.
AN1305.pdf (486.4 KB)
My suggestion would be to get an Android phone with nxp reader chip (there are many) and use tagwriter from NXP to format and write ndef data to the Mifare classic chip.