It sounds like you're asking for a review of — likely a service, tool, or seller claiming to downgrade PS4 firmware (e.g., from 9.00+ back to 6.72 or 5.05 for jailbreaking).
It sounds like you're asking for a review of — likely a service, tool, or seller claiming to downgrade PS4 firmware (e.g., from 9.00+ back to 6.72 or 5.05 for jailbreaking).