Which one is the working Due version?

io53:

ESLEagleEye:
I think a missing crystal is a huge difference. Especially for people who wanted to use the SAMs RTC.

Yes, well if they added the crystal I'd have to agree that it makes a difference, but they have removed it so there will not be any support for using it. Has someone actually gotten a board with the crystal? If then it's just a very small number of boards that has it.

(Don't get me wrong, I'd like the crystal too. But I'm sure they had their reasons for removing it.)

The RTC can be used just without the cystal you can choose in the register to use external or internal clock