Upgrade my psp 2000 from 5.00 M33-6 to 5.50 GEN D-2

finally i got time to flashed my psp 2000 5.00 M33-6 to 5.50 GEN D-2. so, below are the easiest steps:

(I upgraded to 5.50 GEN-D first, then update to 5.50 GEN D-2):

1) First, download the the zip file from XGen v4
2) Open and unzip the file, and you will get two folders, and a file. (PSP, Docs, and 550.PBP)
3) Open the PSP/GAME folder, and you will get another folder named UPDATE. Copy it, and paste it in your ms0:/PSP/GAME.
4) Next, copy the 550.PBP, and paste it in the root of your memory stick.
5) You should now have the UPDATE folder in ms0:/PSP/GAME, and the 550.PBP in the root of your stick.
6) disconnect your PSP from the USB connection with PC, on the psp screen, scroll to GAME/MEMORY STICK and run the installer.
7) If you did everything right, you would now be on 5.50GEN-D.

Once you successfully installed the 5.50 GEN-D, then you can follow the instruction below tp patch your psp tp 5.50 GEN-D2:

1) Download Update D2
2) Open and unzip the file, you will get a folder named PSP. Open it, and you will get another folder named GAME. Open it, and you'd finally get GEN-D2.
3) Copy the GEN-D2 folder, and paste it in your ms0:/PSP/GAME.
4) Scroll to the GAME/MEMORY STICK tab, and run the patch.
5) Your psp now will be on 5.50GEN-D2.