RouterOS v5.8 to v6.42.1

Hi there, I need some information.
I was running MikroTik RH1100AH with RouterOS v5.8. Today I follow this steps to upgrade:
https://wiki.mikrotik.com/wiki/Manual:Upgrading_RouterOS#Manual_upgrade_methods

But something wrong happend. When the MilkroTik reboots it never works. Instead of it, it “beep” and turn on all lights on in a loop mode.

Thanks.

https://wiki.mikrotik.com/wiki/Manual:Netinstall

Thanks you. That was what we need.
For spanish ppl, here is the procedure with details: http://www.inkalinux.com/foros/showthread.php?103-Usando-NetInstall-Con-Router-Mikrotik-(Resetear-Equipo-Password-configuraciones)