Developer neur0n updated Torky's AudioBoost plugin for 6.2X - 6.3X to v4b.
Looking for a nifty app to boost the volume of your PSP? Well, why don't you try Audio Boost Plugin, a handy homebrew app that promises to increase the volume of your PSP's speaker from up to thirty percent more than the maximum volume it can handle.
After you install and enable the plugin, all you have to do is to press the HOME +R to enable audioboost. Just a small warning guys, please use the app very carefully or it might damage your PSP's speaker.
Download-- Add patch for 6.20TN(HEN).