A: Yes. The updater contains a full image, not a differential patch. Just be prepared for a longer flash time (approx. 20 minutes).
However, software evolves, and sometimes, proprietary updaters become the bottleneck. For those still running a DriveRack 260 (or the nearly identical 260M), there is one search term that signals a breakthrough: driverack 260 updater v161 updated
For subwoofer tuning, the v1.6.1 update is mandatory. Because this is legacy software, you will not find it on the official Harman site (they redirect to the VENU360). However, the updated version lives in community archives. A: Yes
Published: October 2023 (Updated Coverage) driverack 260 updater v161 updated