The latest firmware upgrades can always be found here:

• https://thec64.com/upgrade/

You may, for whatever reason, be considering upgrading to a firmware version that *isn't* the latest.

Thanks to MIK from the community forum for pointing out this link to theC64 team's upgrade archive:

• https://thec64.com/upgrade-archive/

(It seems that this page does not exist anymore)

I'll just preserve a history of all firmware changes on this page:

• Includes firmware optimisations and improvements to THEC64 Mini input response times

• Fixes an issue encountered on some two-player games when using two USB joysticks

• Maps additional functions to joystick buttons for some games.
• Makes minor changes to descriptions for some games.
• Fixes an occasional scenario where an additional USB joystick is not detected until a restart.
• Fixes an intermittent audio click when opening the THEC64 Mini’s MENU in-game.