Error updating bootrom
To create a custom software distribution a software package must first be downloaded, the firmware files extracted, and then a configuration file created and modified.There is still some initial setup required but this is a basic as creating a single XML file and then dropping it an the desired firmware files directly into any web server directory.Apple had replaced my logic board but didn't install the newer firmware and so I could no longer boot off of my existing SSD drive (which was formatted with APFS, and had my original Mojave and all of my files). Boot off of Mojave on a USB, and plug in a new blank external hard drive, and install Mojave onto that.As part of the installation process, the firmware was installed. Boot the machine with an USB to install high sierra, by following the standard installation guide. Alternatively, you may use bless to update it manually, as long as the primary internal disk is there.Apple posted that firmware updates require a GUID partition scheme at the archived website Firmware updates for Intel-based Macs require a GUID partition scheme, although the site does not explicitly say this must be the primary drive.When a SDD or HDD is formatted to use a GUID partition scheme by the Disk Utility or command, the EFI partition is automatically created.
This same process can also be used to download files from a custom distribution server for use with the Lync Qualified releases, as covered in the next section of this article , but this central distribution point may not include the most recent versions released depending on what features or capabilities were introduced in the last release.
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Visit Stack Exchange In short, the firmware cannot be updated either by upgrading mac OS to High Sierra or by bless manually. My Mac Book pro info: Attempt 1 - update it by updating mac OS from 10.12.6 to 10.13.2 Failed with error message "An error occurred while verifying firmware". ROM does not support APFS Clearing automation and attempting to rebless. Operation: Verify firmware failed, Failure Reason: Error Domain=com.apple.osinstall Code=512 EFI current Version: [0000000000D30008] EFI update Version: [0000000000D70000] /Volumes/bless.
Also this process can be used to downgrade software if needed as multiple versions can be stored in the same location and a menu will be presented to allow the desired version to be installed.
All currently available versions of the Polycom UCS can be located in the official software release matrix online as well as on the product support page for any model SIP phone.
Basically, the firmware update is copied to the FAT32 formatted EFI partition. Basically, the same procedure occurs for firmware updates on my HP PC running Windows. Having to update the firmware to run High Sierra makes sense.