Notes :
Hi guys,
In view of kinds of firmwares of Pimax 4K exist in our forum, which may misunderstand some new users, so I will continue to update our latest Firmwares in this post, please be advised 
Actually we recommend that update Firmware by Piplay itself which is easily and convenient. Same as below:
Notes: Please make sure that the serial number of your headset same as : 100XXXXXXXXXXXXX ↓
Tool’s link at: MEGA
Or else, if the serial number is 102XXXXXXXXXXXXX ↓please use this tool, link at:
Anyway, you’d better not flash firmware manually if the helmet don’t have a serious issue
Cheers,
Pimax Support
Edit: Some users gave us feedback of this tool could not be run normally because of PC lacks DUF driver, downloading link at: MEGA