blackscreen on RA launch - PSP slim 6.60

Hello,

new guy here, so sorry in advance if i missed anything obvious but i dowwloaded retroarch today and i can’t get it to work on my psp slim 6.60 PRO cfw model. i put the Retroarch folder in PSP/GAME and each time i launch it i just get a black screen. the back light is on and i can see (very dimly) the psp logo in the background like the system froze on the last frame of the launch logo. After this, the system just sits there with the backlight on, without moving or shutting down. I tried both the latest stable and the latest nightly and with the nightly i’ve managed to launch the RA once, then it’s back to hanging up.

what am i doing wrong? I read that recently the PSP port was broken but it was supposed to be up and running with the 1.7.0

also if there is a log somewhere that i can copy or you need additional information, let me know.