Using the Recalbox via HDMI with the RGB Dual attached

[Argonautic]

Hi, I'm using the RGB Dual to connect my RPi3 with Recalbox to my CRT. I'd like to bring it over to a friend's house who doesn't have any TVs or monitors with Scart Connectors, only HDMI. I can't seem to use the Recalbox with HDMI as long as the RGB Dual is attached.
I even tried installing Recalbox to a different SD card but it still didn't work. Recalbox boots in 240p with a stretched image which can be corrected in the options. But booting a game always causes the TV to lose the signal. Can I somehow deactivate RGB Dual so the device only recognizes HDMI?

[greeny123]

Had nearly the same problem, couldn't find a proper solution. Had to restore factory settings to use
HDMI again. Sorry

[Argonautic]

@greeny123 Ok, that sucks to hear. But thanks for the quick reply.