spartan117 :
The main point for downgrading to 1.5 is to be able to flash to a custom firmware, in which enables you to :
- Use game backups
- Enable use of homebrew such as emulators.
- Play PS1 games on your PSP.
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Current PC specs :
AsRock 945GCM-S
Pentium Dual Core E5200 @ 2912Mhz (233x12.5)
Palit Radeon 4850 Sonic 512MB gDDR3
2x2048MB Kingston DDR2 800Mhz RAM