Coldcard mk5 NFC connection issues

[Polkat]

A video has been released reviewing the Coldcard MK 5 wallet, in which a man tries to connect (export the Xpub) to the Nunchak mobile wallet on various smartphones, but is unable to do so. He claims, however, that his smartphones work perfectly with other NFC devices.
There are just as many complaints on Reddit about poor NFC performance in older Coldcard devices. In my opinion, a wallet that costs nearly $170 shouldn't work like this, and Coldcard needs to test its products more thoroughly.

[SFR10]

A video has been released reviewing the Coldcard MK 5 wallet, in which a man tries to connect (export the Xpub) to the Nunchak mobile wallet on various smartphones, but is unable to do so.

He mentioned "it does register on some phones, but it doesn't work very well ^[35:10]" and he showed it worked with his Galaxy S9.

There are just as many complaints on Reddit about poor NFC performance in older Coldcard devices. In my opinion, a wallet that costs nearly $170 shouldn't work like this, and Coldcard needs to test its products more thoroughly.

You have a point, but after reading "this comment from one of their team members" on Reddit, it appears they've deliberately made it like this on Mk4 ^{[probably as a protection of some sort against threat actors]} and they chose to continue with that approach on Mk5.

[Pmalek]

Ben from BTC Sessions made a video where there is a segment where he compared the new Mk5 with Mk4 and the Q. In that video he says that the NFC tag in the Mk4 isn't working that well. He preferred to use SD cards when dealing with PSBTs on that model. According to him, the NFC feature works much better on the Q. He also said that the same NFC tag used in the Q has been added to the Mk5.

Here is another full review of his on the Mk5 with the correct segment dealing with the Mk5 and Nunchuk: https://youtu.be/KZD6BotYpR4?t=2557&si=fvXLoZcznoT1fdMk

Before using the NFC feature, try going into your settings and disable NFC Push TX. That's what he did. There is a message in the video that you might need several attempts before exporting the keys via NFC. So there are issues with it.

[Polkat]

He mentioned "it does register on some phones, but it doesn't work very well

In this article, Coldcard compares the new differences between the MK4 and MK5 and discusses the improved NFC functionality:

Improved NFC performance, now faster and more reliable (tap in top-right corner).

In my opinion, that’s not entirely true.

Before using the NFC feature, try going into your settings and disable NFC Push TX.

The NFC Push TX feature is designed to instantly broadcast a signed Bitcoin transaction to the network via NFC using a smartphone, and the quality of the connection should not affect the export of the Xpub key in any way.