redmi note 7-camera 48mpx & Snapdragon 660


It's using Pixel-bining - it's combining 4 pixels into 1 and you get 12mp photos.
 
SDM660 does support 48MP photo processing, just not in ZSL (Zero Shutter Lag) or MFNR (Multi-Frame Noise Reduction) modes. Be more attentive when reading SoC specs