Hi Sheka, I can understand that you tablet turned off because of weak load, while installing Win10. I guess the install process didn’t work properly, and I suggest : to load to the max your battery, then try to go to BIOS, then reinstall Win10 with your USB key connected. For my own, I used an 3 in 1 Micro USB OTG Hub Adapter Cable, such as http://www.gearbest.com/cables-adapter/pp_213074.html?wid=21
Please note I am just a customer, not a technician nor a sales person ! 🙂
Regards,
Regis