How to permantently update the firmware to latest version?

How can I permanently update the firmware on my TOs to the lastest version?

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You probably want to do four leds factory reset. See:

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Which I have done many times before and when I do then 3 LED, it goes back to 3.2.1 or something…

that’s why I ask how to permantently get new firmware flashed

Then the process failed. Please check what formating your usb flash drive has and if you have correct name of the omnia medkit file.

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I tried with several sticks, I tried several times… always the same result.