I tried exactly that (WinPE) but yet again had issues booting via EFI. I finally bit the bullet, split another gpt partition of around 32gb of my drive and put Windows 10 on it. The update itself was then executed successfully and i wiped the win 10 partition (s) right after. I just find it to be bad support when Intel is involved in the Linux kernel, mesa drivers, and releases firmware blobs for Linux, but then has difficulty porting a simple update utility (which is also available for DOS).
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