How can I downgrade my Psp FW from 3.90 to 1.50?

How do I downgrade my darth vader slim PSP without using an old PSP battery and/or opening the PSP slim batt.?

I have watched numerious videos on how to downgrade my PSP slim, but they require and old PSP battery and sometimes they want me to take apart the original PSP slim battery apart. I tried to get youtube videos on my PSP and YES I CONVERTED THE VIDEOS CORRECTLY. I put them in the specific folder so they can play correctly. All i want to do is play simple youtube videos on my darth vader PSP.
Answer:

u need a pandoras battery and a magic memory card to downgrade it , u dont need tu open ur normal battery, and put the videos in the videos folder on the psp and make sure u convert it tu psp mp4

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