This read-only object reports the internal software revision in the form 'Boot: XXXXXX Bulk1: YYYYYY Bulk2: ZZZZZZ,' giving separate version strings for the boot loader and each of the two firmware storage banks. Unlike cdd564SoftwareRevision's single version string, this format lets an admin see at a glance whether the unit's two firmware banks are running matched or mismatched versions, and whether the boot loader itself is current -- relevant when deciding whether an upgrade needs to touch just one bulk image or also the boot loader. A reading showing Bulk2 at an older version string than Bulk1 would immediately flag to an admin which bank is stale, useful context before deciding which bank to target for the next upgrade.