Older Acekard 2is have hardware ID 44, displays as 4444 on the firmware's help menu.
Newer Acekard 2is have hardware ID 81, or 8181.
Basically, the oldest units can't be updated for 1.4.3, if you bought one recently, it'll be 81 and can be updated for 1.4.3.
You can check by booting the acekard 2i and looking at help under the start menu.
You'll see information for buttons, and under that it should say HWID4444 or HWID8181