I got mine working now on a Beelink T4 mini. I installed the Generic x86-64 image and here is how i got it working.
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Download and flash Ubuntu image on a flash drive or SD card. Any ubuntu will do. I used 20.04
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Copy the downloaded haos_generic-x86-64-6.6.img.xz image into another flash drive or SD card
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Boot with the ubuntu flash drive but select try ubuntu without installing
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When ubuntu is booted, Insert the second flash drive
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Open the flash drive and right-click on the HAOS image, open with disk image writer
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select the T4 mini disk (or NUC or your laptop) as the destination and restore
- When completed, shutdown ubuntu, remove the 2 flash drives and restart