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Finally got this after two months of waiting! A bit uncomfortable and heats up easily, but it's still great to have a retro handheld of my own.
(lemmy.dbzer0.com)
I spent the whole day flashing the MiyooCFW firmware onto it, customizing the menus, and testing which games ran well and which didn't (and constantly trying and failing to get Doom to run on it); I think I'm pretty happy with the end results now.
To put it into perspective, the GBA sp is 21 years old.
When the GBA sp came out, the NES was 20 years old.
Sounds pretty retro to me ๐