Disable or trying to force ME FW v8 images on Type 0606 (Sandy Bridge), its a mod and requires tests from a user side, with high chances of several fails, only a user that can spare such system for testing purposes.
Like the this D30
Officially for type 0606, if you’ve done the latest update Management Engine Firmware Update Tool - ThinkStation C30, D30, S30) package from Lenovo 7.1.92.3273, it’s the last one known.