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Windows 7 does not support Secureboot. ASUS BIOS seems to be blocking the windows 7 here as this update carries win7 bootmgr. I would advice to turn off Secureboot to bring your system to working state again as Windows 7 does not support with Secureboot.

Probably that explains the issue. If Windows 10 bootloader is used, you may not see the issue since bootloader of Windows 10 is trusted by BIOS's Secureboot. Since Windows 7 does not support Secureboot, I am not sure ASUS BIOS is doing the right thing by blocking this bootmgr. Is it possible...

Is it the windows 10 boot loader(bootmgr) complaining about unable to launch windows7? Would it be possible for you to post the screen image where you are seeing this violation?