I recieved a Wii U firmware update yesterday with no issue. Today, I went to Wii mode and discover that everything on screen is in neon color. I put Metroid Prime Trilogy and the entire game is in different color. Try the method of going back to Wii U menu and start Wii mode again, didn't work still with neon colors.
Is this the fault from the latest firmware update or is this issue coming from my Wii U system?