Yubico Forum

Hello, I'm trying to configure a Nano yubikey for U2F only (for now). I've successfully done it and it works on gmail. My problem is rather simple. The LED on the key keeps blinking twice every 2 seconds and it's quite annoying since the key is staying plugged in. From the doc, I gather it is because none of my 2 configuration slots are configured (which is what I want, U2F only for now). Is there a way to make the LED turn off except when an application (Chrome) requests a U2F challenge response? I've tried to configure slot 1, but all it does it turn the LED to always on when connected, not what I wanted.

Can't seem to find documentation on this anywhere. Thanks.

https://www.youtube.com/watch?v=hE56jonuCos

Follow this to reset your YubiKey. Remember to press upload to Yubico at the end

The LED behaviour can be inverted using the personalization tool. Just program one slot and invert the LED.

If you're just trying to set your YubiKey 4 Nano to U2F, why not disable OTP and CCID using the YubiKey NEO Manager? The 4 would then be in U2F-only mode, and the LED won't blink unless it's being queried for U2F.

but what IS the bahavior in the first place, I see no info button in the config tool.


well if at the download section it would state that the neo tool works with the 4 it might help, co zppl might think it's neo only because if the name.