Not to add to the confusion, just for clarity a
Slight correction "almost every HF implant… "
The exception to that is the ISO15693 implants ( xSLX and Spark Original )
The KBR1 is ISO14333a only, which is almost all of the HF implants
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Okay okay, that’s closer to the truth, but not quite true yet. There are exceptions, e.g. VIMPayGO 
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It won’t let you format it. The NDEF data is controlled by the Spark 2 itself (in particular, the URL as it’s got a cryptographic hash on the end is). As such, you can’t write over it.
Whatever you wrote most recently - our API just redirects taps to where you set.