READ THE WHOLE GUIDE BEFORE ATTEMPTING TO DOWNGRADE OR INSTALLING CFW! First of all download PSPident: http://www.psp-hacks.com/file/1725 Run it using 6.20 TN HEN-B or TN HEN-C on your psp and check what it says for motherboard model. If it corresponds with one of the models listed in the compatible models list below, go ahead and read the entire guide or else leave it or you'll brick your psp. This will also work with older psps like the older psp 2000s which have TA-088v2 and below and psp phats. Their motherboard models will be different and lower than the ones mentioned below. Compatible motherboards: TA-090v2 TA-088v3 TA-092 Now for the guides. Guide 0: How to downgrade your psp(6.31/6.35) HOW TO DOWNGRADE YOUR PSP TO 6.20 1) Charge your PSP to something above 75%. 2) Download this: http://www.psp-hacks.com/file/2048 (follow step 3 after downloading) and this: http://www.psp-hacks.com/file/1855 (follow step 4 after downloading) 3) Extract the PSP folder from the RAR file to the root of your memory stick(the area when you're not inside any folder). 4) Go to the PSP folder on your memory stick. Create a folder called GAME here and create a folder called UPDATE inside it. Extract the file from the RAR file from the second download link to this folder. 5) On your PSP, run the downgrader(Go to GAME -> Memory Stick) and follow the instructions. Guide 1: How to downgrade your psp(6.20) HOW TO DOWNGRADE YOUR PSP TO 5.03 0) Download 6.20 TN HEN-C here: http://www.psp-hacks.com/file/2046 Extract it to the root of your memory stick and on your PSP go to GAME -> Memory stick and run it from there. 1)Charge your PSP to something above 75% 2)Download: http://www.megaupload.com/?d=84ZXOKHI and http://www.psp-hacks.com/category/36 ( From the second link, download 5.00 and 5.03 updates) 3)Start 6.20 TN Hen-B or TN Hen-C on your psp and connect it to your PC using a USB cable. 4)On the root of your psp (the area when your not inside any folder), extract the 5.00 update. Go to PSP -> GAME in your memory stick and create a new folder called UPDATE here. Place the 5.03 update in this folder. 5)Now, extract the contents of the first download link to PSP -> GAME located in your memory stick. 6)Disconnect your PSP, go to GAME and run PSARDumper. Press the circle button and wait for it to do its thing. Once it’s done, press X to exit. 7)Reconnect your PSP. On the root of your PSP, create a folder called seplugins. Now go to the folder f0 which should also be on the root and inside it go to vsh then etc. Copy the version.txt located there and paste it inside the seplugins folder that you created earlier. 8)Disconnect your psp, make sure that you’re in 6.20 TN Hen-B(Skip this step for TN Hen-C) and press select to bring up the VSH menu. Go to “Fake Index.dat” and change it to “enabled”. Next, select “restart vsh” 9)Now run the 5.03 update.(on your psp, go to game -> memory stick and it should be there inside it) 10)Follow the instructions to update and you’re done! NOTE: If you get a white screen on booting, take out your battery, put it back in and hold SELECT, START, SQUARE and TRIANGLE while switching your PSP on. Guide 2: Getting the best CFW on your newly downgraded psp GETTING THE BEST CFW ON YOUR NEWLY DOWNGRADED PSP Warning: Spoilers inside! 1)Download this: http://www.mediafire.com/?gnnwijzymmr 2)Put the h.bin file on the root of the memory stick(the area when you’re not inside any folder) 3)Open DaRKcLoUD-X V2 4)Grab the PSP and the PICTURE folder and put them on the root of the memory stick. 5)Go to photo on your psp and just click X once.(If your psp hangs and shuts down, look at the NOTES section. 6)Now, dowload 5.03 GEN-C: http://pspslimhacks.com/custom-firmware-5-03-gen-c-released/ 7)Put it inside the PSP/GAME folder and run it from your PSP and install it. 8)Now, download Prometheus: http://www.psp-hacks.com/file/1952 9)Do the same thing to run it and install it. 10)Go here: http://pspslimhacks.com/signed-5-03-kernel...t-hen-released/ and choose the download which corresponds with your PSP model(checked using PSPIdent) 11)Put the folder from the archive in PSP/GAME and run it from your PSP NOTES: 1)If your PSP shuts down while trying to run Darkcloud, reset default settings and change the theme to original. 2) Prometheus needs to be installed while running 5.03 GEN-C. 3)If you turn off your psp, you need to run 503 kxploit from your memory stick. Thats it. If any new developments occur, I will update my guide accordingly. Hope this helped! Also, if this works for you, don't forget to say thanks After you're done with using the guides, you can delete everything except 503 kxploit because it's needed for running CFW. EDIT: I'm noob_helper from psphacks. Please do not blame me for copying things from my own posts! I just posted this here because I thought it's going to help some people since the post on psphacks went to the second page. EDIT 2: Added 5.03 signed kernal exploit to Guide 2. Start chickHEN with installed CFW (Prometheus or GEN) from the XMB without a reboot! EDIT 3: Added downgrade instructions for people on OFW 6.31/6.35.