I have just started up my pi-top pre assembled unit, and it worked fine both with the internal LCD and an external HDMI monitor.
Then I attached a 4inch RPi LCD display with XPT2046 touch Controller.
That display showed nothing, and in the attempt to make it show something I followed a guide on the internet and performed some sudo ./LCD-hdmi commands.
Unfortunately now I am in a situation where non of the monitors work, not the internal LCD nor the external attached hdmi.
Fortunately I can still SSH to the device. Please help me with some commands with which can bring back my monitor output both to the internal LCD and the external HDMI
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So I ended up flashing the SD with the OS again