That script is over 6 or 7 years old. It hasn’t been maintained probably in 5. There is a solid chance much of it doesn’t work. The driver’s are included in the FreePBX distro so no script is used. Their forums may be best as they know the state of the project over there and any quirks that need to be accounted for. That script basically did a fingerprint on the system and managed through the quirks for each known build.
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