Download the firmware file named VSX934_Boot_Update_R140-1222-2200-0014.zip (or newer).
If you have a VSX-934, ensure you are running the latest software to experience these fixes: pioneer vsx934 firmware update fixed
Summary
: Patches addressed "PLS WAIT" errors on the front panel and network menu lockouts that prevented access to iPod/USB features or factory resets. How to Update Your VSX-934 pioneer vsx934 firmware update fixed