F5OEO is working diligently on improvements to the Pluto firmware.
As of March 2021 “perseverance” is the current version.
If you are doing DATV you will not get around this version. But also for other applications it has advantages.
Download Link: http://qra.f5oeo.fr:2080/perseverance/
The usual procedure via config.txt works with some Pluto versions, with others not. With version Rev.B it was not possible to set the gateway IP, with the F5OEO firmware it worked, with version Rev.C it also worked via config.txt.
Open the Pluto web page (F5OEO Firmware only!)
and go down to “Pluto Configuration”. There you can enter the gateway address, it will be saved permanently.