Don't know A series menu But advice to look at every hole on Service menu... Can't help you since I don't have A series TV. Wish you have success.
Don't know but there might be a TOP debug menu for A series too...
I mean that, it tels if that country has PAL sys nor not...
Firmware developers distro means that that file is available on developer's OS. Not available on your tv. that /home/username... structure used in PC linuxes. I don't think if you could find that file. Might be available at sources, if samsung open those but I think they dont.