impossible to instann macOS Catalina Security Update 2021-003 (and 004)

Hello,

I'm facing a problem with my NUC10 Hackintosh. My NUC currently runs 10.15.7 (19H1030).
When I try to update to Security Update 2021-003, or to standalone Security Update 2021-003, or to Security Update 2021-004 it goes like this:

the progress bar of installer never reaches the end, it cuts at about 1/6th or 1/5th and reboots.
the OpenCore boot menu is displayed but no option is selected.
if I select the installer from boot menu, it goes to a black screen for few seconds then goes...

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Author: p4tpr0