your sons psp is bricked download this and follow what i say Pandora Deluxe 1.2
and this 4.01 official firmware
Open the Pandora Deluxe 1.2 and install.
Unrar the 4.01 official firmware and place the EBOOT.PBP in a folder on your desktop named 4.01.
Connect your PSP
and enable USB. Start the Pandora Deluxe 1.2 program, while it is
starting it will ask you if a certain drive letter is your PSP, make
sure it is correct and click ok.
Click on the "Load 4.01 firmware" button and it will ask for the
location of it. Find the 4.01 folder on your desktop, double click it
and it will show EBOOT.PBP, select it and clickk OK. Then check the
install box next to it. In the colum to the right select "Despertar
Cementerio v7 (4.01m33-2)". Now just below that in the center is a drop
down box with DCv7 next to it, drop the box down and select LEFT. In
the box right below it check Format + Prepare Memory Stick, If you need
to backup your memory stick select it. Make sure that the PSP Drive
letter is correct and when you are ready to start press START.
When the operation is complete, disable the USB, disconnect the PSP and
turn off. Remove the battery. Hold down the LEFT Trigger while
inserting the PANDORA battery and continue to hold until the menu comes
Select NAND operations, then IDStorage tools. In that follow the
prompts on the screen. Select your region, then turn on wifi switch and
pres x to Get Real Mac and continue on till finished.