Analog Way does'nt work at DGX HDMI Input Board after Firmware update

Is there a known workaround to fix the following problem:
A Analog Way Pulse 300 is connected via DVI-HDMI cable to a HDMI Input board. Everything worked perfect until a DGX Firmware update. After the fwu no picture. But if I insert a Blackmagic preview montitor in the HDMI Input chain, everything works again. I know, there is a dgx command to fix the Problem. But I don't know that top secret command...
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OK, problem fixed:
I used a shell command "set BCPU3_bg_vsync_disabled=ON"
3 means my 3rd HDMI input board.