Writing to an empty tag
To write the unique code to an empty tag, go to 125 kHz RFID —> Saved -> [CARD NAME] -> Write
There are different types of re-writable empty tags, they support different protocols and some evade the checks of the readers. The most popular type is T5577. They work with all the protocols that the flipper supports: EM4100, HID26, I40134.