Mifare card writes fail with "No connected device can write this kind of card" on both Proxmark 3 (RDV 4) and Chameleon Mini #126
Description
I'm trying to write simple Mifare Classic 1k cards that I've captured in Walrus, from Walrus, but it just fails with an error message in both these cases.
I have attempted to write these captured cards both using my Proxmark 3 (RDV 4) and my Chameleon Mini, connected in Walrus with OTG cable to my Pixel 2 mobile (and working fine in this same Walrus instance for reading cards, so there is no connection problem) but as soon as I press the "Write" button in Walrus, for any such card, I just immediately get the error message "No connected device can write this kind of card".
Both the Proxmark 3 and the Chameleon Mini should indeed be able to write such cards though, so what might the problem be?