MPC freezing. with JJOS1

Hi guys i got tested JJOS3 and found out i have some freezes and the metronome not playing correctly like some missing notes.

i decided to went back to my JJOS1 and the freezes remained.
i found out that my load up screen tells me that OS3 is still on my machine as you see in the following Images.
I pushed erase and then power supply before i reinstalled OS1

My question is how do i really delete OS3 from my disk and make my MPC work again correctly?


i don't know how to upload photos.
so i write down what it says

loading sreen "


MPC 1000 (128MB Installed)
JJOS1

TAP TEMPO + Power on ----- OS3

Plug it into the PC and delete the .bin file? (or what ever the OS3 file type is)

Not sure if it will help you out but that is how I deleted the JJOS stuff before I settled on one.