I'm trying to reinstall a Toshiba C850D - 107 laptop back to Windows 7 after a failed Win 10 upgrade attempt by a novice...
I've downloaded an ISO and burned it to DVD and created a bootable USB also but I can't for the life of me get the sodding thing to boot from either, I've googled extensively and it appears I need to change the bios from secure boot mode, changing from UFEI to CSM mode in the bios, but, there is no such option available to me!
I'm assuming I'm missing something, perhaps some way to unlock an advanced part of the bios perhaps? I'm usually pretty good with such things but am getting nowhere with this one.
I've tested my media on another - non Toshiba - laptop and it reads both USB and DVD fine so I'm sure it's the Toshiba and its bios at fault here.
Google seems full of people with similar issues on these models but most seem to resolve it by disabling secure boot and selecting CSM instead of UFEI as I say, if I could find / enable this option, I'm sure I'd sort it.
Normally, I'd pull the drive and plug it in my desktop, alas though I'm in Cyprus on holiday and trying to fix the Toshiba for some OAP - and clueless - friends of who we are staying with....
Help me OC/UK Laptop forum, before I throw the damn thing in the pool!!

Thanks.
I've downloaded an ISO and burned it to DVD and created a bootable USB also but I can't for the life of me get the sodding thing to boot from either, I've googled extensively and it appears I need to change the bios from secure boot mode, changing from UFEI to CSM mode in the bios, but, there is no such option available to me!
I'm assuming I'm missing something, perhaps some way to unlock an advanced part of the bios perhaps? I'm usually pretty good with such things but am getting nowhere with this one.
I've tested my media on another - non Toshiba - laptop and it reads both USB and DVD fine so I'm sure it's the Toshiba and its bios at fault here.
Google seems full of people with similar issues on these models but most seem to resolve it by disabling secure boot and selecting CSM instead of UFEI as I say, if I could find / enable this option, I'm sure I'd sort it.
Normally, I'd pull the drive and plug it in my desktop, alas though I'm in Cyprus on holiday and trying to fix the Toshiba for some OAP - and clueless - friends of who we are staying with....
Help me OC/UK Laptop forum, before I throw the damn thing in the pool!!


Thanks.

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