I know but I’m referring only to software, not hardware which is identical.
Even BDR-209 and BDR-S09 have different Kernel/Firmware ID but they are the same device.
So, in other words, even if you’re absolutely right saying that bdr-209 can’t be crossflashed to 211, I’m pretty sure it is only a software (firmware) limitation and nothing more.
And I think, also, it is a commercial move to force users which like Pioneer, to buy the expensive UHD model, only to be able to read UHD discs. (Of course for those who want a real UHD device).