That's got absolutely nothing to do with it! Sony Optiarc was born back in 2008 which in ODD terms means lots and lots of generations of Sony Optiarc drive releases, with the vast majority of them being supported by Binflash thanks to Liggy!
You don't say! :doh: Maybe you ought to visit http://binflash.cdfreaks.com/ before making that sort of judgement
Besides, you'll be far more likely to win the jackpot twice in a row and be hit by a meteorite as you cash your prize money, than Sony ever releasing a dump tool ... therefore I would instead suggest that you have a little fate and patience and now that we have an identification file for this drive thanks to Joltee, wait for Liggy to add Binflash support for the AD-725x family (which incidentally is an AD-726x rebadge) when he's got some spare time ...
You might also find interesting the last 4 posts in here: http://club.myce.com/f86/overview-different-nec-firmwares-96140/
If HP released a firmware for one member of the AD-725xH family, maybe DELL will also release an update sometime in the near future ... if anything, DELL is much better than HP at releasing ODD firmware updates ... so there's still hope!