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if you are on stock boot.img, (boot.img=ramdisk+kernel) then flash any kernel, every kernel's zip is ready for stock base, BUT if you flashed a custom kernel, it means it has changed both kernel+ramdisk tweaks, so you have to flash stock boot.img again of same rom installed, then flash magisk if you had magisk, then flash new kernel, otherwise kernel's tweaks gonna merge and dont know how they will behave