6.60 Pro is a L(CFW) or not PERM.
If you want a PERM solution:
1) Install 6.60 OFW
2) use "6.XX Downgrader v5
" to downgrade to 6.39
3) then, since you have a PSP 1000 use 6.39 Me-2 Installer to put you on CFW thats PERM. PSP Custom Firmware 6.39 ME-2 (For PSP 1000 and 2000 ONLY) (w/Download Links) - YouTube
I didn't know the "cpuid" will make it perm. Awesome.