Just to be clear, the applet is upgradeable (by the user) on these devices, yes?

jlgaddis · on April 24, 2015

The answer to my question is apparently "no".

> YubiKey NEOs are not upgradable based on best security practices. There is a no upgrade policy for our devices since nothing, including malware, can write to the firmware.

-- https://www.yubico.com/products/yubikey-hardware/yubikey-neo...

fluidcruft · on April 24, 2015

The early NEOs were upgradeable, the recent model that has U2F support is not.

jayrox · on April 24, 2015

right and this makes me sad since my neo doesn't include and cant upgrade to include u2f ;\

fluidcruft · on April 24, 2015

IIRC not being able to add U2F to the old NEO was about missing hardware support for elliptic curve cryptography, which is now present in the new NEO.