I just notet that if you save a screenshot in the AP3_P100 firmware (v2.6 hardware/1.51/2.52) there is no blue color in the screenshot, guess that a minor bug!
what 3rd party firmware is available for the v2.6 hardware and is “better” than the stock firmware (I don’t really like the navigation)
hard to tell exactly how the navigation should be done, but it should be more intuitive. at the moment its a bit guesswork how a specific menupoint can be reached (for example the voltage and time setters which are on the bottom of the screen).