May I know which game you play? Yesterday I tried all my games, many of them had to change to JIT before the cheats could work, while NCE had no effect. except the only game that can't cheat is tale of immortals. :(
some cheats actually working in Yuzu, you need to change setting from NCE to JIT. for example story of seasons FOMT, Metroid, Crisis Core etc. Might need to write this in front page. GLHF
But Nintendo's GBA video format is different, being that it uses a custom ROM and chipset for rendering, for like the Shrek and Shark Tale titles. Been undumpable for years and years.