If the manufacturer’s update servers are decommissioned (common for 2021-era devices), use the offline method:
Updating drive firmware is a delicate process. Unlike a Windows update, the drive cannot lose power during the flash process, or the drive may become a "brick" (unrecoverable). rr52c03a firmware 2021
The year 2021 saw a massive surge in home NAS builds and enterprise storage expansion. As drive densities increased, the margin for error in drive mechanics decreased. rr52c03a firmware 2021
Search for the panel model number online to find its exact native resolution (e.g., rr52c03a firmware 2021