Sensor fault.
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Does it mean it’s ruined? Or can I still use it?
Might be buggy/corrupted firmware but looks to be a damaged sensor. I’d send it off to get it inspected. Ask them to test it before doing any work. Purple colouring is corrupted data feed from the sensor to the display and SD card. Software is trying to display it as accurately as it can hence the colour tinting. I’ve had a few canons do this over the years.