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I tried downloading a Hyper-V image and replaced the hs_main file with the hs_main file from the Experte 4.3 (install Experte 4.3, look at the directory structure, you’ll find the firmware of the HS3 and HS4. unzip/unrar it…. unzip/unrar again.. see the /hs/ directory and find the hs_main file)