This is the safest method, as the player will verify the correct version for your specific hardware automatically.
Some older models (BDP-S300, BDP-S350, BDP-S5000ES) had a critical "C-13:00" patch released around 2009-2011. Search for:
If you are certain you need the legacy "Zero C," use this direct legacy link (still active as of 2025):
https://www.sony.com/electronics/support/compact-disc-players-other-products/...
(Write to Sony chat support if the page is hidden; they will email you the binary.) download sony blu ray zero c upd
Sony does not label files as "zero c upd." You must match your device’s model number.
Step-by-step:
Typical official filename: BDP_S3700_M24.R.0177.EXE (but users colloquially rename it).
After restarting, go to Setup → System Information to confirm the new firmware version is installed. This is the safest method, as the player
Player is Unresponsive After Update: