I have tried to setup the full screen browser, but is seems that is it running in a strange resolution: 800x800 and not in native 1280x1024. How do I change the resolution?
Have you set your target resolution in the settings tab of your setup?
There is no settings tab.
You could force a resolution using /config/tvservice (See https://info-beamer.com/doc/device-configuration#forceoutputresolution). Since 800x800 is a really odd mode, I suspect there might already be a setting in either /config/tvservice or /config/userconfig.txt?
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Off cause… You are right 
Thanks!