Following these steps will erase all accounts from your Yubikey.
Step 1
On your computer, download and install the Yubikey Personalization Tool from the Yubico website.
Step 2
Once the program is installed, insert your Yubikey into a USB port.
Step 3
Wait until the light on the Yubikey is a solid green. (If your computer prompts you to set up a new keyboard, close the window and continue to step 4.
Step 4
Open the Yubikey Personalization Tool.
Step 5
Select Yubico OTP Mode.
Step 6
Click on the Quick button.
Step 7
Select Configuration Slot 1.
Step 8
Uncheck Hide Values.
Step 9
Click the Write Configuration button.
Step 10
If you are warned about overwriting the values in slot 1, click Yes.
Step 11
If you are asked to save a log file, you can save it or cancel.
Step 12
Leaving the Yubikey Personalization Tool open, continue to Enrolling the Yubikey.