Hello Everyone 
i do appreciate if anyone have an idea about how to to downgrade router CCR1036-12G-4S from v6.xx to earlier v5.00 >>>if any one can suggest some sort of method i would be more than grateful.. 
Not possible.
Tille (CCR) is supported only in V6
but it got to many bugs just like :
pppoe client get connected to router and you got near by the user dynamic but not running!!!
and when i remove it and the user logged in again it get running dynamic !!!
and also interfaces disappear then showed up !!!is there is solve to that maybe i missed something?
and thank you so much for the quick replay
I have the same problem.
RB 1200 v6rc11
Do you use 6.0RC12? If not, upgrade your router. A lot of bugs is fixed http://download2.mikrotik.com/routeros/6.0rc12/routeros-tile-6.0rc12.npk
If you have rc12 and still problems then report to —> support@mikrotik.com