Somewhere I should have a copy of firmware KPFY for the 5232X. It was an unreleased version I was sent by Benq’s excellent UK support. (A few years after they quit the ODD business!)
Unfortunately I couldn’t persuade it to upgrade either of my 5232X drives - one running KPEY, the other still on KPDY.
If I can find the file I’ll post it here so other people can have a play.
A brand new (sealed) retail 5232W has just appeared on Ebay UK: