3y hijack lol
If the console had a SD slot it could be updated. I did it back in 2009/2010, but for a specific model (sys version, if I remember correctly v112), not a very good update it only changed 2 flags, but improved a bit the quality. Then in 2016 a Russian team release 3 more updates for 3 different "models" good updates, but only for, again only specific "models". Plus before that the Russian scene was fixing game by game they even released a tool the auto fix at least games using the GEMS audio driver. And finally between 2017 and 2018 a brazilian team release a "universal" update for all Atgames clones RK2 based, the best update.
RK GOAC is used by Radica clones and early Atgames ones.
RK2 GOAC aka FIRECORE used by all later Atgames clones.
RK2 aka FIRECORE uses a Truecolor color palete and some other minor enhances/fixes. If used color enhanced MD/G games can be done, thou not compatible with original MD/G consoles.
And for what I know Atgames has license to produce GG, MS, MD, Sat, DC sega home hardware. It may have changed along the years, but the initial contract was that.
(sorry my English)