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Hello please help me! I upgrade both drives PCIe/NVM 1TB blade SSD and replaced the HDD with a 2.5" SSD with thermal sensor now SSD now recognized what should I do now?
At this point use Command (⌘)-R to enter into macOS Recovery services then from within it format the drives (both) and setup the PCIe/NVMe with a fresh copy of macOS using the installer. Reference: Mac startup key combinations
