made a compilation video on how to get your rp3 going with the image file retro pi 4.3 ...i also go over how to enable the online updater for the retropi 4.3 ... i haven't played around too much yet to know the full spectrum, but i have resolved most issues regarding getting cheats enabled for GBA...any ROM you want i would just google the name...
here is a RAR file containing the image,the programs to flash to your rp3.enjoy :) :https://drive.google.com/file/d/1lGOe...
00:00-00:50 flashing retropi 4.3 image to microSD card using Etcher
00:51-02:00 enabling SSH on your retropie OS
02:01-03:09 uploading ROMs thru PC using WinSCP
03:10-04:39 testing if games uploaded to emulation station
04:40-07:27 editing code to ENABLE Online Updater for Retroarch
07:28-08:10 updating cheats thru Online Updater
08:11-09:33 toolkit command to enable QUICK access cheat folder directory
09:34-11:19 how to open retroarch on a GBA game to activate codes