While it cannot magically gain HDMI 2.1 features (like 4K/120 VRR on Xbox Series X without a workaround), it now performs exactly as the original box promised. The eARC is stable, the Atmos decoding is flawless, and the Zone 2 phantom activation is gone.
A: Partially. The pop when switching from PCM to Dolby Digital is reduced by 70%, but a slight relay click remains. That is hardware-based relay engineering, not a software bug. If your Pioneer VSX-934 has been collecting dust due to these issues, pull it out of storage, grab a USB stick, and install the fix today. You’ll feel like you bought a brand new receiver.
The unit will reboot itself twice. When it's done, the display will say "OK." Turn the unit off, remove the USB, and turn it back on. Sometimes, even after the update, residual settings from the old firmware corrupt the new one. If you installed the update but nothing seems fixed, you need to perform a Factory Reset after the update.