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The PSP 300x was released in the U.S. on the 15th of October 2008. Repair of this device requires only common tools.

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Why does the UMD driver affect button presses?

Basically, whenever I load a disc into the tray, the left button is interpreted to be constantly depressed by the system. This only happens when a disc is loaded. Could this be solved by flashing the system?

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No, don't flash the system. What's probably happening is that the flex ribbon for that side has been corrupted/damaged some how. I had to do this for a 3000 system on both sides, the 'L' and 'R' buttons didn't appear to be triggering until I got into a game (God of War for instance) and when I started playing, I could see problems.

Best thing to do is get a replacement 'L' button flex ribbon off eBay (shouldn't be more than $2) and follow only parts of this guide till you get to the ribbon that needs to be replaced: PSP 300xc Motherboard Replacement

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