The YubiKey 4 and YubiKey NEO have five separate applets, all of which have different processes for being reset. Each applet is listed below, along with the link to the article that covers the steps for resetting it.
|OTP||Resetting the OTP Applet on the YubiKey|
|FIDO U2F||This applet is not configurable and cannot be reset.|
|PIV (Smart Card)||Resetting the Smart Card (PIV) Applet on Your YubiKey|
|OATH||Resetting the OATH Applet on the YubiKey|
|OpenPGP||Resetting the OpenPGP Applet on Your YubiKey|