Difference between MF and MV firmware for Zyxel2602HW?

I have tried to get sense out of Zyxel support about this but,
although they're generally quite helpful they don't seem to be very
forthcoming about this.

Can anyone tell me what the difference is between the firmware with MF
in it name and the firmware with MV in its name? It depends how you
navigate the www.zyxel.co.uk site which software you get to.

If you click on 'Downloads' from the top page you get to the following
firmware:-

P-2602HWL-61C_V3.40(MV.4)C0_Standard.zip
P-2602HWL-61C_V3.40(MV.3)C0_Standard.zip
P-2602HWL-61C_V3.40(MV.1)C0_Standard.zip
P-2602HWL-61C_V3.40(MV.0)C0_Standard.zip

If on the other hand you take other routes (e.g. via Support/Products)
you can find these:-

P2602HW-61_V3.40(MF.2)C0_Standard.zip
P2602HW-61_V3.40(MF.1)C0_Standard.zip
P2602HW-61_V3.40(MF.0)C0_Standard.zip

It would appear this has something to do with the slightly different
model numbers, P2602HW-61 and P2602HW-61C but I can't find anything
that tells me the difference between these either.

--
Chris Green

.