A bit confused.... my chinese tablet was delivered with w8,1 activated with Heldigards KMS Pico from manufacturer CUBE. I loaded a clean w7 and activated with Daz loader. Got the offer from MS to upgrade to w10 and did so. Everything went ok, w10 turned up as activated. Checked windows key with MTK. It was a new and different keycode than in w7 as expected. Checked the key again with a program "Keyfinder". It showed yet another key!!!
Before you start using it (filling it with important files) try a clean install or Reset. Just to make sure it stays activated. I've got a Tablet that was in the Insider Program and is activated with 10240 Pro. But if I clean install or do a reset, it fails to activate again. Now that I know, I've imaged it, so I won't lose activation if I forget and accidently do a clean install.
sofar so well... Tryed to erase the old Windows file <windows.old> to save space. Used System and Admin rights but nothing seems to work. Any advice please?