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Samsung A7 (2018) Software Update Issue (June 2020 Security Patch)

After installing the software update (security patch June 2020) for my Samsung A7 (2018), my screen flickers in some of the apps. And whenever I scroll, the screen becomes double (lower screen freezes while the upper screen is the one moving). And when I need to select a button/a photo, I have to guess where it really is on the screen. Is there a solution for this? I've tried factory reset and wiping out system cache. I also tried to downgrade the firmware using Odin, but it keeps on failing. Please fix this. Smiley Sad