Once you have downloaded your "Extra Quality" file, installing it on your custom firmware (CFW) PSP is simple:

Once you have your clean ISO files, you can play them either on original hardware or via emulation. On an Original PSP or PS Vita

Push this setting to 16x . This ensures that textures viewed from sharp angles (such as roads in racing games or floors in third-person shooters) remain perfectly sharp instead of blurring into the distance. Safe Practices for Building Your PSP ISO Library

(compressed) files. ISOs offer the fastest loading times, while CSOs save space on your memory card but might cause minor stuttering in graphically intense games. Quality Check