[I decided to write this guide as many people have encountered problems with UMDGen.
One such problem was that the ISO size increased considerably when UMDGen was used.

So here are the instructions step-by-step on how to modify an ISO using VCDROMx:
1. Download VCDROMx English version from here: http://www.psp-hacks.com/file/183
2. Extract the file and open VcdRomX.exe
3. Click Cancel when a dialog box comes up.
4. Go to File-->Convert File.
5. Under the heading "Source", select the type as .ISO
6. Click on the picture of a folder next to the name box and browse to an select the ISO
you want to modify/fix
7. Under the heading "Target", select the Type as FCD or VCD
8. Click the folder next to name and then type in a name for the FCD and press OK
9. It will now convert. It will now convert. When it finishes press Close
(even if it says "99%")
10. Now go to File-->Fix VCDROM and then click on open VCDROM.
11.Browse to and select the FCD or VCD file that you created before and select it
and press OK.
12.From here its pretty self-explanatory from the menu you can extract,
replace and dummy files

Step-by-Step Creating an ISO:
1. Open up VCDROMx and click New.
2. Click on the folder button and browse to the place you would like to create the ISO
and type in a name for it and clickOK
3. Choose a volume label, any will do
4. Leave the VCDROM type as normal and pressOK
5. Now drag and drop the files you want to make an ISO out of (e.g PSP_GAME and UMD_DATA.BIN files)
6. Do any modifications that you want to do and click Save
7. Now use the File-->Convert File function to convert the FCD file you made
into an ISO (check above for more info)

not my work i borrowed it ok

cheers dee247 should be made a sticky

it was along time ago but peeps didn`t use it much so i tink highlander had a clear out and prob took that off i`ll get him to put it back ok

If its to add patches, I would suggest ppf-o-matic. And if its to get the iso smaller, then just buy a bigger memory card. lol.

But ace tutorial, this program is much better than umdgen.

made it a sticky.

i have made a copy in the stickies section.

dont thank me for it lol i only leeched it from another site but yes is cud tut