My assumption is that the MK4 will work similarly well
While the MK4 does have NFC, the signal seems to be much weaker than the Tapsigner's. I can't get mine to talk with Nunchuk via NFC, and this seems like a common problem reading around online.
You can of course still import / export files the old fashioned way via micro SSD, but it would be nice if it worked.
Thanks for pointing that out. I have no idea that the MK4 NFC signal is weak. Yes you are correct, can always fall back to using PSBT over microSD for Coldcard, provided that the phone also has a microSD slot.
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