The following information refers to the firmware of the Agilent LC modules.
Agilent releases LC firmware in sets for modules, which have been tested for interoperability. A set typically covers a range of firmware revisions, for example, A/B/C/D.07.0x, with variable values for x.
All Agilent LC instrument firmware sets have been designed and tested to be fully backward compatible to Agilent chromatographic data systems (CDS).
The module firmware in each set is fully compatible and interoperable with firmware for all other modules in the same set.
Firmware of different modules is linked, for example, between host modules (B/D-firmware) and hosted modules (C-firmware). When firmware within a set is upgraded, all modules in a system must be updated to the current firmware revision within that set.
Agilent recommends that you always keep the LC instrument firmware up to date in order to include the latest improvements and bug fixes.
Do not mix firmware revisions from different sets. This has not been tested and may cause issues.
If you have to document the firmware revision (for validation purposes) please use the term "Revision XXX or later" or "Firmware from Set XXX or later". This might help in discussions in the case of required updates due to malfunctions that have been corrected in later releases.
For details, refer to the tensive information provided on the web site https://www.agilent.com/en-us/firmwareDownload?whid=69761