@xGeox : Conversion is normally not permitted, unless there was a technical issue (or bug) that has changed the personality. Open a technical support case to investigate the issue and come up with a mitigation.
Also, It's not just about changing the 'bootarg.init.flash_optimized' option, the internal KB is available on the Internet (if you are ok to pay for it, strangely). Anyway, the point is not that. There is a whole 'commercial aspect to it' Licensing & Regulation which must be followed and it's up to NetApp.