How to enter sleep mode on EZ-Flash? (EZ4 miniSD)

Hello guys!

I have this Flashcart:

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i installed kernel v2.05

How can i make games enter sleep mode like original GBA games, for example Metroid Fusion when i go to start menu and click "enter sleep mode it sleeps". It doesnt work with EZ-Flash...

i cant seems to figure out. Can you help?

Thanks!