This is the primary source. Search for "2920" or "J9726A" in the software downloads section.
Some legacy files remain on the HPE My Networking portal, but ASP is the standard for the WB software branch. j9726a firmware
Reviews often highlight how the firmware enhances the device's stability and performance. For instance, the J9726A firmware might bring improvements in packet processing, Quality of Service (QoS), and error handling, leading to a more reliable network experience. This is the primary source