I have been out of discussion for couple of years. using old apm 2.5

I understand that apm 2.5 is obsolete and cannot use latest software mp 3.XXX …
where can I get older version to install into my apm 2.5… want to use on plane
tq friends

The APM 2.5/2.6 is still a viable product.

Last version of firmware is 3.2.1

Mission Planner will see the board and install the correct version for you.

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Wow thats good to know… will try connecting. Thank you very much sir