Unfortunately, these NOAC consoles tend to have either a TSOP-56 flash, or some sort of carrier board for BGA flash soldered onto it. Toss in some crappy and pirated games, they are ready to be sold to the market for 5 bucks and to (possibly) calm down a kid before he/she get bored of it.
What I got for myself is the carrier-board version. Removing it could be a PITA - I would either break the BGA, or probably the entire board if I'm not careful.
A look in the EEVblog forum article (https://www.eevblog.com/forum/beginners/fun-project-hack-cheap-handheld-console-help-with-bga-nand-flash-chip-needed/ ) shows that the carrier-board could have been using the general SOP-44 pinout for flash:
Armed with the logic probe, I must see what are the addresses that are accessed during its bootup...