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After writing up how to use generic MIFARE cards with Lockly locks, I had 30 cards sitting on my desk that needed provisioning. The manual process would have taken about 30 minutes of copying and pasting Proxmark3 commands. Instead, I spent an hour and a half writing a script to do it in 6 minutes. Laziness prevails. The Problem The manual approach works fine for one or two cards. You run hf mf autopwn to recover the key from your original Lockly card, then write that key to Sector 0 of each generic card using two hf mf wrbl commands. With copy-paste, maybe a minute per card. ...

Lockly RFID locks use standard MIFARE Classic 1K cards (13.56 MHz), but ship with one sector key changed from the factory default. This causes generic cards to fail enrollment. Using a Proxmark3 on your own Lockly card, you can recover this key and write it to inexpensive generic cards in about 5 minutes, saving up to 96% on replacements. Important clarification: This process does not clone an existing card or bypass your lock. It prepares a blank generic card so it can be enrolled through the Lockly Home app just like a new Lockly-branded card. You still go through the normal enrollment process; you’re just not paying $8 per card to do it. ...