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How to fix boot to disk in Windows 10 v1607 with legacy BIOS
Hello,
I have an Asus U46E laptop (circa 2011) originally purchased with Windows 7 Ultimate 64Bit and problem free. It's since been upgraded to Windows 10 Pro 64Bit v.1607 and in all respects but one seems to be working fine. It won't launch from a rescue boot disk in the D: disk drive.
I researched as much as I could about this issue and the PC's System Information shows the BIOS Mode is Legacy and Secure Boot is Unsupported. My boot-up order shows device before HDD and every reboot confirms the disk drive is being accessed and spins the disk before moving on to the HDD. This issue apparently has something to do with Windows 10 UEFI and its Secure Boot feature, which also speeds up boot-ups.
I've tried every combination of boot-up keys, F2, F8, F10, F12, with and without shift+ and also tapping the F key or holding it down. Shift+ Restart F2 gets me into the UEFI Settings>Troubleshooting>Advanced>Startup Options> Restart but it still won't boot to the rescue disk or into any BIOS-like menu. It just continue to boo up the the HDD with Windows.
The bootable rescue disk which was accessible before updating from v1511 to v1607 was by Acronis. Now I've switched to Macrium Reflect and have created bootable rescue disks with WinPE v.10, v.5 and v.4 to see if the lagacy detail would help. None work.
I think the solution is to get into the BIOS (not sure if UEFI is BIOS) or the UEFI and turn off Secure Boot or Fast Boot but I don't see how or at least it's not following the instructions I've read. Can it be done via CMD window or Safe Mode? The downside is I'd lose the security of Secure Boot for the insurance to be able to use a rescue disk if needed. Can Macrium Reflect do a system backup restore without the rescue disk (Acronis needs their rescue disk in their free version)?
Thank you.