Change UMD unsuccessful?

[ikarosmelan]

Hi everyone, I just finished disc 01 of the game Akaya Akashiya Ayakashino, and was asked to switch to disc 02. I have an .iso version of that one on my laptop, but when i tried changing UMD it just didn't work. If I started from disc 2 it will ask me for disc 1. I really want to play the next part, but I don't have a clue on changing discs.

I use Win 10, 64 bit. PPSSPP ver 1.2.2

I appreciate your help. Thanks.