Solved update SecUpd2020-002HighSierra issue with @UtterDisbelief workaround method. Thanks for sharing the information @pit512 and @UtterDisbelief. It's work!
Updated via download the macOS 10.15.3 Update from 10.15.2, no issues. I had to select the correct drive in Clover 5103 on three reboots. Install took about 21 minutes.
T-Rex_SK (U3E1) (Clover)
i3-6006U/ Skylake-U/Y
HD 520, 1366x768
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