PSP loader on CFW 4.89?

I have 4.89.1 HFW on an early PS3 slim that had 4.89.

HEN and package loader are working fine.

Multiman can load PS1 and PS2 games perfectly fine.

PSP keeps complaining there's no loader. So I installed 2 loaders.
But I keep getting the same error.

Is it possible to use PSP loader on 4.89.1 HFW? Or do you need 4.88 firmware?

Thanks!