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In this Instructable I will show you how to compress your psps' backups from ISO to CSO to save space on your memory stick, using only one piece of software that is usable with Wine In Ubuntu. You will also need a CFW (Cusstom Firm-Ware) psp to make any use of this.

Step 1: Get the Software

All you need to complete this Instructable is YACC, and If you are using Linux or mac, you will need Wine to emulate a windows environment.
You will also need a backup of your UMD game, in an ISO form.

Step 2: Boot Up the Software.

Now extract the files from the RAR that you've downloaded from the YACC website. then run the YACC.exe file and a window should come up that looks like the one shown in the picture below.

Step 3: Find Your File Then Compress!

In the box that says Input ISO filename, find your ISO then click open, In the Export box a file will automatically appear in the same place as the original ISO, you can change this if you would like to, but I will not. Lower on the screen you can see a select file output You can switch between in CSO,DAX,and JSO for a psp you will have to make sure that you have it set to CSO for a fast compression rate. You will also want to keep the compression level on 9 to make sure that you have a high quality compression.

Step 4: Send the Newly Compressed Files to Your Psp

The name of the step says it all, place your newly compressed files in the ISO folder of your psp. If you are using Ubuntu I noticed that my computer would say the file was transferred completely, but my psp disagreed. So when you are transferring the files your psp will have a bar that is moving back and forth, once this dissapears unmount your drive then disconnect your psp. The below picture shows what happens when the file finishes.
This Program doesnt compress files larger than 2GB :'(
How good is the Compression Say a 500MB ISO how much would it be as an CSO?<br />
Personally, I ahve never had any troubles with the compression, so I would say excellent!<br /> <div id="refHTML">&nbsp;</div>
Ubuntu rocks! I use it for my Home PC's.
Awesome!!! Thanx alot man,imma try this
no problem have fun
How can I convert CSO to ISO?I need ISO for an experiment but I can only find CSO's.
on YACC there is an decompression tab

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