CFW-master, neur0n, has released yet another custom firmware, which again is for PSP-1000 and PSP-2000 models only. So if you’re a longtime PSP’er and you like rockin’ the absolute latest in terms of official firmware, but you still want your [unsigned] homebrew and ISOs, then update to 6.39 ME v1. Yessir — have your cake and eat it too. And like neur0n’s other custom firmwares, you can dual-boot OFW by pressing and holding the “Home” button on startup. Now that’s cool.

Features

• Support Unsigned Homebrew
  Support Extra module ( = plugins )
  Support ISO mount with M33driver, NP9660driver, OEdriver, NormalDriver and MEdriver
  Support UMD video
  Support converted PSX(PS1) game and custom DOCUMENT.DAT
  Unlock 480×272 avc video
  Unlock max display brightness lenel without AC adapter
  Unlock ExtraMemory for Homebrew ( slim only )
  Unlock Slim color in XMB.(need to prepare bmp file
  Support USB battery charging
  Support CPU speed control
  Support hide PIC0.PNG and PIC1.PNG option
  Support Flash0/1/2/3/UMD mount with USB
  Support fake region
  Support Battery EEPROM option in recovery menu
  Support to load Unsignated module
  Support to load packed ( with Dark_AleX’s psp-packer ) module

Install
Install an existing CFW or HEN first; 5.00 M33 / 5.50 GEN / 6.20 TN-D / 6.20 and 6.35 PRO-B5 are good to go
Download the OFW 6.39 update, extract and rename EBOOT.PBP to 639.PBP
Copy 639.PBP to PSP/GAME/UPDATE on your memory stick
Download and extract the CFW 6.39 ME v1 package
Copy UPDATE/EBOOT.PBP to PSP/GAME/UPDATE
Run the 6.39 ME v1 Installer from the XMB

See Readme.txt for more info.

Update: neur0n has quickly released v2, fixing a silly bug where your PSP would crash when trying to access PSN

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the CFW worked but i cant seem to play ISO or CSO games
can i get some help?

downgrade to 6.20 PRO-B5...it is NOW possible to downgrade from 6.38 and 6.39 to 6.20, then install PRO-B5 Perm...pretty awesome isnt it?...it plays ISO's/CSO's with the new Inferno ISO driver, Homebrew, PSX's, and has PSN Enabler built in....and its way better than ME v2...check out our PSP Tutorial section and find SwoRN's video tut on how to downgrade from 6.39 and download the extra files in the description that are needed...after that just follow the video....its very easy and safe....but if you dont want to switch, then i would suggest finding an ISO Loader...a Google search will probably find it for you.

Nato is the 6.20 PRO-B5 better than the 6.20 PRO-B4?