Button does nothing on MDK USB Dongle

[SaphireLattice]

Expected Behavior

The "press me" blinking stops and I'm able to use at least some U2F demo/etc

Actual Behavior

Nothing happens, the LED keeps blinking. I am also unable to re-enter DFU mode again

Steps to Reproduce the Problem

1. ./deploy.py --board=nrf52840_mdk_dfu --opensk --programmer=none
2. python3 uf2conv.py -c -f 0xada52840 -o target/opensk.uf2 target/nrf52840_mdk_dfu_merged.hex
3. Copied the uf2 firmware over after having to update from older bootloader version

Specifications

• Version: 1.0.0, f2496a8e6d71a4e838884996a1c9b62121f87df2
• Platform: https://wiki.makerdiary.com/nrf52840-mdk-usb-dongle/

[kaczmarczyck]

Hi!

I tried on both the stable and develop branch, following the docs like you have been, and both work as intended. With the press of a button, the blinking stops and registration finishes.

I'm not sure if I can help you at this point. A few ideas:

You were able to enter DFU mode (which includes a button touch), but now it seems all button functionality is gone? You could try other button functionality, i.e. anything in Chrome settings here: chrome://settings/securityKeys. Not all of them are supported by OpenSK though.

Or if you don't mind breaking the device and like fiddling with hardware, open the plastic cover and check the button.

[SaphireLattice]

Oookay, just tried it in chrome. U2F/FIDO does not work, but WebAuthn/FIDO2 works fine (at least on demo sites)

Firefox however uh.. just keeps the token asking and when I press the button, it faintly stutters and continues to blink >_>

Greeeeeat... sigh. Thanks for the tip on that though!

Weird the bootloader died, though

[kaczmarczyck]

Firefox problems might be related to missing U2F support. Have you configured your device? That adds a certificate that U2F needs.

./tools/configure.py \
    --certificate=crypto_data/opensk_cert.pem \
    --private-key=crypto_data/opensk.key

Not much I can say about the bootloader, but thanks for reporting!