Staying on 3.52 M33 means you cannot play newer UMD games released after 2008, many PlayStation 1 eboots run poorly or not at all, and you miss out on critical modern features like permanent patching on non-2000/3000 models, improved memory stick compatibility, and better plugin support.
: 6.60 is widely considered the most stable firmware for plugins and Custom Themes (CTFs), often preferred over 6.61 due to better plugin support. Upgrade Path & Common Obstacles
