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I formatted my Insignia Tablet because it would not allow me to enter it, or do anything because there was no free space left on it, to let me do anything. So now it boots up with UEFI, and my PC won’t read my tablet through USB…How do I get out of this or how can I install Windows 10 on the tablet through my PC if it won’t read it? I think I’m screwed, am I right?

you shud install uefi windows 10 RT, download windows 10 rt with uefi and install with third party software like Rufus or other which supports GPT

If you want to reinstall Windows 10, you can go to the software download website, select the link that matches your version of Windows, and create your own installation media using either a USB flash drive or a DVD. You can make it with a third-party software like MiniTool Partition Wizard. Important Back up your files before you install or reinstall Windows on your PC or next time before you format your computer. Do prepare the things before you go to the download website. A PC with a reliable internet connection A USB flash drive or DVD A product key

its not working with insignia flex, if you set usb boot at first priorty and diisable windows boot manager it still skip the usb and reboot loop