Here are some tips to fix the Yocan UNI Pro fire button stuck.
1) Remove the tank from the battery.
2) Use a pair of tweezers or pliers to turn the firing stuck button counterclockwise a few times.
3) The button on your Yocan vape cart device should now be unstuck from the battery.
If your device still can't work, please contact Yocan support team at [email protected]