Reinstall SwOS firmware
It is possible to upload and install SwOS firmware using BOOTP. This example shows how to reinstall SwOS using RouterOS.
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Warning: Each RouterBoard switch series have their own firmware which cannot be installed on other series models! In case wrong installation is accidentally done, correct firmware has to be reinstalled following these instructions.
RB250GS supports SwOS v1.0 and newer.
RB260GS supports SwOS v1.7 and newer.
RB260GSP supports SwOS v1.11 and newer.
Configure IP address and DHCP server with BOOTP enabled on the installation router.
/ip address
add address=10.0.0.1/24 interface=ether1
/ip pool
add name=dhcp_pool1 ranges=10.0.0.2-10.0.0.254
/ip dhcp-server
add interface=ether1 address-pool=dhcp_pool1 bootp-support=dynamic disabled=no
/ip dhcp-server network
add address=10.0.0.0/24 gateway=10.0.0.1
Upload new SwOS firmware file to the router filesystem.
[admin@MikroTik] /file> print
# NAME TYPE SIZE CREATION-TIME
0 swos-rb260-1.14.lzb .lzb file 38142 sep/02/2014 08:40:17
Configure TFTP server.
/ip tftp
add ip-addresses=10.0.0.0/24 real-filename=swos-rb260-1.14.lzb read-only=yes allow=yes
Hold the RESET button of the switch when starting it.
After few seconds ACT LED will start blinking. Wait till ACT LED blinks twice as fast and release RESET button.
Make ethernet connection between the switch Port1 and ethernet port you configured DHCP server on. After few seconds new firmware should be successfully uploaded and installed.
http://wiki.mikrotik.com/wiki/SwOS