hmmm, if it your getting that error (no such device), then you have,
a. applied the .ppf wrong.
or
b. someting in the file structure is wrong. psp homebrews need EXACT file structures, or they will refuse to boot, look for anykind of spelling errors, even try changing it from caps to uncaps/uncaps to caps. if it has came with no corrupted data save structure, try changing it to a normal kxploit boot. some psp's dont play nice with that kind of exploit for some reason.