Before installing Windows 10, please test your recovery drive.
It probably WON'T work as all the Linx 7 recovery USB drives I have tried (from several Linx devices) are faulty.
I have recently been in contact with Exertis (the UK Distributor), and they confirm they have no way to repair the device, and no access to a recovery image that works.
You may be stuck with no options if you try and upgrade this to 10. (I wasn't installing 10 when i broke this one.. its been bust for a while )
For me im going to just create a new WimBOOT from 8.1 Pro and install that to get my test tablet working again.. but beware that you might not be able to (easily) restore to 8.1 if you delete the recovery partition.