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First you will need to grab "tycommander". It's part of a group of software tools included in the tytools package.
Get your tytools package for your particular OS here: https://github.com/Koromix/tytools/releases
Next, download the latest firmware, free from our store, please take note that there are two versions for every release.
One is for the current display - this is the one you LIKELY need if you purchased after May 1st 2025. But no worries, one of the two will work!
Plug in the AMC3+Touch and Upload the firmware using tycommander, as shown below.
That's it! You now have the latest firmware.