I'm unable to find Good Lock in my samsung M51

https://www.samsung.com/in/shop-faq/cancellations-and-returns/Currently we accept returns of products only if they are certified as Dead on Arrival (‘DOA’) by our Authorized service centers.If your shipment has any performance issues, please visit o...

actually customer care genrate a doa certificate

only in dark wallpaper

in not like blur effect it's like pixelating image.