MP 1,1-5,1 MP 5,1. Sonoma installed with OCLP moved to NVME; now Windows on SSD won't boot (Solved)

[aj19876]

I apologize in advance if this has been discussed or is common knowledge. A quick search turned up no obvious answers.

Original configuration: Mac Pro 5,1 w/ RX580. Two SATA SSD's installed in the optical drive compartment. SSD1 has OCLP 1.4.3 with Sonoma; SSD2 has Windows 11 (MBR w/ Windows 10 installed from DVD, later updated to Windows 11). OCLP bootpicker would show Windows partitions as "Legacy." This configuration worked without any issues...

I moved the Mac OS Sonoma w/OCLP to a M.2 NVME on a PCIE card. Windows remain on a SATA SSD. Booting from the NVME drive, Open Core bootpicker correctly shows Mac and Window partitions. Mac boots fine, but Windows would not boot if I select Windows from the OCLP bootpicker, screen would display these 4 lines in verbose mode then freeze.

Resetting NVRAM (4 bongs) did not resolve the issue.

 

[aj19876]

I did a clean install of Ventura with OCLP on the NVME drive. It now again dual boots with Windows 11 on a MBR SSD.

Issue was not with OCLP. Something about Sonoma on NVME w/ OCLP would keep a MBR drive from booting.