You have two SecureBoot certificates/dbs/pks, each one inside one store of the NVRAM volume, not six.Code:1185570 0x121722 Certificate in DER format (x509 v3), header length: 4, sequence length: 986 1251106 0x131722 Certificate in DER format (x509 v3), header length: 4, sequence length: 986
Your NVRAM is probably already very fragmented, at the moment the best indicator of fragmentation is the quantity of MemoryConfig entries and the incorrect free space indicator of the NVRAM Volume. Most dumps of bricked Mac Pros have around 29 or 30 MemoryConfig entries, I'll send you a PM later with instructions on what you need to send me for a BootROM check.
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