Fat hardmod pandora, slim PSP.

Someone please link me to the magic files needed to downgrade the slim. I'm not sure whether or not the fat magic files work.

I don't have the link, but what you want to use is Despertar Del Cementario. That is the only program that works on slims.

Thanks. I found v4 of DDC. However After I created the DDC stick, and placed my fat pandora. The power LED would simply illumate without any image on the screen. I followed all the steps, whats wrong?

If the memory stick and wi-fi lights don't illuminate, then the PSP entered service mode without launching DDC. I believe that means you didn't put the IPL on the memory stick. If you have a homebrew PSP, try UPMS, as it installs every necessary file. There are probably easy-installers out there you can use if you don't have a homebrew PSP.

The slims have a glitch sometimes...try flipping your power switch to the hold position, insert the battery wait a minute (or until the green power light turns off) take your battery out, then flip your switch back to its normal position and insert the battery while holding the L trigger.

Ive tried everything from replacing the eboots to replacing the memory stick, from using dark_alex's guide to using EZ gui based installations. This stubborn slim simply will not boot up the DDCv4.
Steps I took:
formatted stick via PSP XMB, then formatted via mspformat
created folder psp, then game. dropped DDC in folder
dropped 340, 380, 150 in root dir
ran app without custom theme on fat psp with kernel set to 3.71
ran DDC installer
ran msinst for the IPL(even though there was already an IPL in root dir?)
removed 340, 150
Set mem card and pan batt in slim, took staxx's suggestion)
Nothing has happened. Please send me more suggestions.