If you've seen claims of a "working English patch" for Shin Sangoku Musou 6 Special on PSP, please share the source – it's likely either fake, machine-translated with broken text, or applies only to menus. I'm happy to help verify any specific patch file or guide you toward the most playable option available.
If you prefer Japanese voices with English text, the Undub Preservation Project has released patches for several western Musou titles, though their focus is typically on titles that already had an English release. No english patch! - Shin Sangoku Musou 6 Special - GameFAQs shin sangoku musou 6 special psp english patch better work
If you want to play Dynasty Warriors 7 on the go, the official Dynasty Warriors 8 for PS Vita or the Switch port of DW8XL are technically superior. However, Shin Sangoku Musou 6 Special offers two things no other portable Warriors game does: If you've seen claims of a "working English