To install Windows 8.1 ARM64 on a non-standard device, you cannot simply use a standard USB flash drive. You will need a specific set of tools. Required Hardware
Install Windows 11 ARM64 or Windows 10 ARM64 . Both provide official ISO downloads via the UUP dump website or Microsoft’s Insider Program. They run x86, x64, and ARM64 apps natively or via emulation. windows 81 arm64 iso install