| Problem | Likely Cause | Solution |
|---------|--------------|----------|
| QEMU crashes on start | Missing UEFI firmware | Ensure QEMU_EFI.fd is correct for ARM64, not x86. |
| Blue screen: INACCESSIBLE_BOOT_DEVICE | No VirtIO driver during install | Use if=ide for the ISO and switch to virtio after driver install. |
| Extremely slow GUI | No GPU acceleration | Add -device virtio-gpu-pci. On Linux, add -display sdl,gl=on. |
| QCOW2 ballooning to full size | No TRIM support | Run the guest-side TRIM command and use discard=unmap. |
| Keyboard/mouse not working | Missing USB controller | Add -device qemu-xhci -device usb-kbd -device usb-mouse. |
Elite troubleshooting: If Windows hangs on "Getting devices ready", add -cpu cortex-a72 instead of host during first boot.
QEMU + HVF (Hypervisor.framework) gives near-native speed.
qemu-system-aarch64 -accel hvf -cpu host -M virt,highmem=off ...
Note: High Sierra or later. No need for Rosetta 2 for QEMU itself, but Windows 10 ARM will emulate x86 apps. windows 10 arm qcow2
As of 2025, Windows 11 ARM is the active development target. However, Windows 10 ARM remains popular due to lower system requirements and better legacy x86 compatibility in some edge cases. The exact same QCOW2 workflow applies to Windows 11 ARM64.
Microsoft has moved toward providing native ARM64 ISO downloads via official channels for Volume License customers. For developers, QEMU + QCOW2 remains the most open, cross-platform, and scriptable way to test ARM Windows.
qemu-system-aarch64 \
-machine virt,accel=kvm \
-cpu cortex-a57 -smp 4 -m 8G \
-drive if=none,file=win10-arm.qcow2,id=hd0,format=qcow2 \
-device virtio-blk-device,drive=hd0 \
-netdev user,id=net0 -device virtio-net-device,netdev=net0 \
-bios /usr/share/qemu-efi-aarch64/QEMU_EFI.fd
(Adjust CPUs, memory, firmware path, and virtio device names to match your environment.) | Problem | Likely Cause | Solution |
Windows 10 on ARM is not publicly downloadable via Microsoft’s normal consumer ISO pages. It is distributed through:
Legal Note: You need a valid Windows 10 license. The ARM64 version uses the same license key as x86/x64 Windows 10.
Unlike raw .img or .vhd files, a qcow2 disk grows dynamically. A fresh Windows 10 ARM installation might report 20GB used inside the guest, but the actual host qcow2 file could be as small as 5–7GB. This makes it perfect for: QEMU + HVF (Hypervisor
Note: If you only find Windows 11 ARM, that works too, but this article focuses on Windows 10 for lighter resource usage.
Cause: Windows 10 ARM’s x86 emulation is single-threaded and CPU-intensive.
Fix: Allocate more CPU cores (but no more than the host’s physical cores). Disable “Windows Sandbox” and “Virtualization-Based Security”.