Any service claiming to downgrade your console is either:
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). sistrodowngradeps4
Since this appears to be a specific seller or handle (possibly on a marketplace, Telegram, or forum like PlayerSquared or Wololo), here’s a general based on common experiences with PS4 downgrade services. Any service claiming to downgrade your console is