Note: When you click the links below to download the firmware, it indicates that you have already read and agreed to the Open source licenses.

Click here to know how to ugrade the Q5's System firmware

Here is something download links: 

USB DAC Driver（v4.47.0）: Click here to download

Q5 sysetem firmware file - v0.52: click here

Q5 system firmware upgrade tool: click here

If you meet any problem in upgrading,  you could contact FiiO (support@fiio.com) about that.