Button Combos
More System Information
- Go to XMB
[Settings] > [System] > [System Information] - Press simultaneously
+ 
+ 
+ 
for a few seconds - Release those buttons then immediately press
and keep it held - While holding , press once to have the menu stay up on it's own.
Note: More information: More System Information
QA
Getting the QA Flag Menu
Set your cursor on (not in) Network Settings and press the key combo (all at the same time):
+ 
+ 
+ 
+ 
+ 
You should see Edy Viewer, Debug Settings, and Install Package Files if done correctly.
Note: Requires QA-Flag enabled in EEPROM. More information: QA Flagging
Shop
Unlock Demonstration Mode
Note:
Set your cursor on (not in) Security Settings and press the key combo (all at the same time):
+ + 
+ 
Note: Requires unlock code afterwards. More information: Unlock Codes
Web browser
Unlock browser debug settings and information mode
The combo needs "Internet Browser Debug" from CEX debug setting to be set to "On"
New combo
Open the browser, hold and press 
- Thanks to haxxxen for sharing it's findings
Old combo
Open the browser then press simultaneously the combo:
+ + + + + +
+ 
It's a little bit difficult combo, but has interesting features like UI Settings > Motion type: 1 that enables coverflow for tabs.
- Thanks to Luca93xD for sharing it's findings
PS2 Netemu
Unlock Configuration Mode and Debug Information Mode
Note:
Inside a PS2 game, access the ps2netemu menu by pressing 
and press the key combo (all at the same time) for a few seconds:
+ + + 
then press 
for two new options in netemu: Debug Information and Configuration.
- Credits to picard for his awesome RE skills
