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Acronis TrueImage 2018 Recovery flash drive BOOTMGR error

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Last week I created an ATI 2018 recovery USb flash drive. Today, I needed to restore my new Windows 10 PC and when I plugged the flash drive in and changed to boot sequence to USB, I received the error message "No BOOTMGR Press CTRL + ALT + DEL". suggestions?

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Rob, welcome to these public User Forums.

Sorry but more information is needed to understand what issue you are seeing here?

What size of USB flash drive are you using?
Note: minimum size 2GB, maximum size 32GB, formatted FAT32.

Has the USB flash drive been used previously for other purposes?
Note: it is sometimes necessary to completely clean USB drives for them to work correctly.

Use the following from an Administrator level Command prompt or Powershell window.

Preparing USB drive for use by Acronis using Diskpart
diskpart
list disk   (to identify USB drive, i.e. 1)
select disk 1
clean
create partition primary
active
format fs=fat32 quick
assign
exit

What BIOS mode does your Windows 10 OS normally use when booting?
Note: if Windows is working, run the command 'msinfo32' to see the BIOS mode used.

See KB 59877: Acronis True Image: how to distinguish between UEFI and Legacy BIOS boot modes of Acronis Bootable Media

Which type of Acronis rescue media did you create on the USB flash drive?

For the rescue media, there are 3 different versions available:
Simple:  created based on your Windows Recovery Environment for WinPE media.
Advanced: created based on Windows ADK (or AIK for earlier OS versions) - WinPE media.
Advanced: created based on a small Linux distro OS (BusyBox).

I would recommend creating the Windows PE version of the Acronis Rescue Media as described in the KB documents below. 
KB 60820: Acronis True Image 2018: how to create bootable media
KB 60091: Acronis True Image 2018: how Simple bootable media creation mode works

Don't forget to check your bios to see if secure boot is enabled too.  Secure boot will prevent third party usb drives from booting in most cases - especially if it's the Linux version of Acronis rescue media and not a WinRE or WinPE version.

Most new computers (pre-built by a vendor like Dell, HP, etc) come with secure boot enabled by default these days. It does make the system a bit more secure, but limits external disk booting at the same time.