In general, Intel states that the OROM does not need to match the version of IRST. Users routinely update IRST with no updates to the OROM. Whether or not it is always better to update the version of IRST is a much to general question, without defining what "better" is, and without considering all the details of the system, what OS it uses, changes to IRST for a new OS (like Windows 8), etc.
The OROM code is a part of the BIOS/UEFI code, and is only able to be updated through a BIOS/UEFI update. I have never seen a non-BIOS update program for the OROM. Mother board manufactures rarely include OROM updates in their BIOS/UEFI updates, some occasionally do, others never include a new OROM.
A few technically savvy users have learned how to literally modify a BIOS file and insert a different version of the OROM code. The new OROM code is extracted from a BIOS file, and inserted into the BIOS file of target mother board to be given the new OROM.
Given the capability of some Intel platforms to support TRIM on RAID 0 arrays of SSDs (Intel 7 series chipset that support RAID, except for X79) when using a version 11 OROM and version 11 IRST driver (there is some debate that the OROM must be version 11.2 or greater, as well as the version of IRST), users of earlier chipset platforms (ie, Intel 6 series) have become more interested in a modded BIOS with these OROMs. Other "small" modifications to the BIOS and OROM were found to be necessary in order for TRIM in RAID 0 to work on the earlier platforms. There is also the factor of determining that RAID 0 TRIM does function on platforms with the modded BIOS and OROM, with apparently both success and failure.
Searching on "modded BIOS" or "modded OROM" will give you an idea what exists, and you may even find a modded BIOS and OROM for your board. Use at your own risk, of course.



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