hi
i have had my mikrotik for about a year now and its been pretty good recently it started to play up on boot it just says on the lcd “loading kernel from nand” it will sit there and do nothing for hours if you let it some times when you boot it up hitting the reset button a couple of times by chance it will boot up and run but as soon as you reboot it breaks into the same error as above im using a RB2011UiAS-RM i have used netinstall to reinstall “routeros-mipsbe-6.28rc20” but still this stupid boot issue comes back again the only thing that has changed is me stupidly pressed upgrade firmware within winbox it says its firmware 3.22 i dunno if this is what is giving me issues but the box is now useless until i can workout what is doing this i have no seriel port on this modem to be able to seriel in and netinstall that way but i dont see that helping as netinstall did work via ethernet
any suggestions ?
Have you try with RouterOs 6.27 and netinstall?
The console could be useful to at least see what error messages might be showing up there when the router hangs.
their is no null modem cable connection that i can see anywhere on the router it does have a rj45 connection on the back of it that i have no idea what it does i assumed it was the netinstall port until i got it working on eth one
That’s a serial port. (rs232)
It’s the same pin layout as a Cisco router’s console cable, so if you have an RS232 serial port, you can use one of those blue Cisco console DB9->rj45 cables. If you don’t have one, here’s a good how-to on making one.
http://www.instructables.com/id/Simple-RJ45-DB9-Cisco-console-cable/
They also make those DB9 ends with pins that you can crimp onto the individual wires (no solder required) and poke through the holes yourself, so don’t freak when you see the picture of the soldering iron. 
This is the serial port on your routerboard