steen:
Hello Folks!
We are also upgrading to 5.6 from 5.4 and 5.5, 4.17.
There has been some incidents, when upgrading RB450G and RB411 from 4.17 to 5.5 they never came back up on the network, visiting the router’s we discovered that all ethernet leds were off but blue led was on. Fully dissconnect the power and put it back again solved the problem. Upgrading from 5.5 to 5.6 was not an issue.
Please MT, can you do something about the upgrade scenarios, like automatik failback, and automatik restart on previous firmware. Failsafe functions should be implemented like last known good and so on. Other devices we have do so, like our IBM AIX servers.
There is a bug with 4.1X when you try to reboot it shuts down instead, discovered this as usual the hard way when a weekly scheduled reboot resulted in routers shutting down, this is fixed in the 5.X series so i never reboot a 4.x series unless i am close by to re-cycle the power.
http://forum.mikrotik.com/t/4-16-scheduled-reboot-caused-router-to-shutdown/43452/1
http://forum.mikrotik.com/t/fix-router-reboot-problem/44024/1