Yes you are correct and the same information mentioned here as well,
https://h41111.www4.hpe.com/storage/msafirmware.html
"UPGRADE NOTE: If upgrading from an older version of firmware it may require a multiple step process to get to TS252. If below TS230 then upgrade to TS230P008 first, then TS240P004, and then TS250P003 before upgrading to TS252P005. If the firmware is between the mentioned versions, it is recommended to follow through the steps as well.
If multiple upgrade steps are required, it is recommended that HPE Support is engaged in the upgrade process."
Hope this helps!
Regards
Subhajit
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