Sony KDL-55W802A - Wyłącza się po 15-20 minutach, 8 mrugnięć LED, aktualizacja oprogramowania

Hi,
I have this tv that works for about 15 to 20 minutes and then turns off, leaving the led to blink 8 times, this via HDMI, because I can't get into the tuning menu, it says Function unavailable.
Through the manual, I was able to verify that it could be a software problem, but unfortunately the tv already has the latest software and that's why it won't let me update.
Does anyone know of a way to reinstall the software?

Model SONY KDL-42-55W802-809A it"s chassis RB1G ( from 2013)
- other




Read Link

SM (service manual) Link