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With a few simple mouse clicks you'll be ready to create & manipulate PSP (UMD) compliant ISO images. UMDGen v4.00 changes:

• New layout
• UMDGen now displays information from UPDATE\PARAM.SFO as well as PSP_GAME\PARAM.SFO
• Optimize button added. This function automatically detects and resizes dummy data, removed un-needed padding and dummies the contents of the UPDATE folder (if detected)
• Non-PSP standard images can be forced to be read by the user. Upon detection, UMDGen will let you know the image is non-standard and you can choose whether to continue and have UMDGen attempt to read it - *NOTE* depending on the individual image, this could cause UMDGen to close if it encounters data it isn't expecting - but the general rule is if the PSP can read it then presume UMDGen can too.
• UMD_DATA.BIN file generator. If your compilation is missing this file then UMDGen gives you the oppertunity to create a new one.
• Ability to change "PSP_SYSTEM_VER" in PARAM.SFO to different firmware version. (Use +/- key while version is selected)
• 'Drop Open' images re-introduced due to a lot of requests to re-add it to UMDGen.
• Complete CSO + DAX support. You can now edit compressed images the same as uncompressed images. Dax support now includes the use of Non-Compressed areas feature.
• 'Ezip' format removed. We didn't think it was worth keeping this format since it only had very limited support anyway.
• 'Dummy File' option added as requested by many users.
• v3.50 still had trouble with one or two problem images. A lot of code to do with the reading/writing process has been restructured and these problems should now be fixed.