Difficulty in changing boot order with linx 10 windows tablet PC

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Hello everyone, i am a newbie to this forum and need help if poss...
As mentioned in the title, I simply cannot boot from anything else but windows boot itself.
I have successfully changed the boot order in BIOS but the system ignores my command and overides it, always booting up windows.
I want to use Acronis True Image to backup the system and although recognised when re-starting, it too is over ridden.
So far I have tried to boot from USB and External Optical Drive (had to throw away as it was locked up).
I'm sure it's because this tablet PC has it's own recovery system built in, trouble is, I have to perform a complete software re-build because I dont use windows own restore system (rubbish).
Is it possible to use Acronis or boot from any other device. Please help & enlighten me if you know the way. Thanks guys & girls. Cosmo