Hello. As title says, my question is: why is RB133 supported by RouterOS v6 while RB133C isn't? They have same hardware, except RB133C have somethings missing.

mikrotik.com/download says: "RB111, RB112, RB133C, RB150 devices are not supported in v6, please use v5.".
Is this right? Can I upgrade my RB133 from v5 to v6 or it was a mistake when writing such info?

Because the RB133C is missing things... I think you answered your own question. :)

Most likely it's due to RB133C has insufficient amount of RAM.

Most likely it's due to RB133C has insufficient amount of RAM.

yes

Thank you all.

I was thinking only on CPU model and forgot amount of RAM.
So, it's safe to upgrade archaic RB133 to v6.

RB133+nv2=deeeeep hang only 802.11 or nstreme works more or less