It is much easier if you have a proper data.zip file. That makes the trick not the sys.txt. I have spent hours modifying the sys.txt and was no effect of it.
Tho in data.zip within ui_android dir if you modify the multimode.ini you gonna have a perfect 1024x600 resolution using the 800x480 directories.
[modes]
; mx=WidthMin..WidthMax, HeightMin..HeightMax,Folder
; OR
; mx=Width, Height ,Folder
m3=1024..1280,552..800,"800_480"
that is all I have within multimode.ini file cause I use it in a car so I dont need portrait settings only landscape.
I have got a perfect data.zip as well without all unnecessary contents (35 Mb) also branding.zip and sys.txt but like I said at the beginning you only need a good data.zip.
Spoiler: link
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