Umm...well you cannot buy a brand new psp without getting the infamous ta-088 v3 or ta-090 v2 motherboards in them.

Only three suggestions:
- Buy a new one, then break it. (refurbished/repaired psps have hackable motherboards)
- Try ddc v8 and hit "test m33" every time you boot your psp
- Go for Half Byte Loader.

Z640