Does anyone have the PRS-600 updater file please?

I recently found my old PRS-600 and was atempting to try our the PRS+ firmware on it, but the process got interrupted and bricked it!

Now its stuck on the "Firmware update did not complete successfully" screen.

I have found the various posts that have solutions, and I gather I need to restore the original Sony firmware, but since they stopped supporting it this year, the PRS-600 updater is nowhere to be found! It's even missing from the PRS+ repo...theres a 650 updater in there, but no 600!....

Does anybody at all still have a copy saved please? Or know of a working download?

Thanks in advance