How to fix Wave 7inch Touch Display-C Grey screen issue in Raspberry Pi

Edit file: sudo nano /boot/config.txt

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
disable_overscan=1

# uncomment to force a console size. By default it will be display's size minus
#framebuffer_width=1280
#framebuffer_height=720

# uncomment if hdmi display is not detected and composite is being output
hdmi_force_hotplug=1

# uncomment to force a specific HDMI mode (here we are forcing 800x480!)
hdmi_group=2
hdmi_drive=1
hdmi_ignore_eid=0xa5000080
hdmi_mode=87
#hdmi_cvt 800 480 60 6 0 0 0

hdmi_cvt 1024 600 60 3 0 0 0

hdmi_cvt: width height refreshrate 

Read thread: https://www.raspberrypi.org/forums/viewtopic.php?t=14914

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