OpenWRT on Edimax 3G-6200n without soldering

Installation

1. Enable telnet server:
   • Log in to www interface, lets assume it is at address http://router
   • In address bar go to hidden sub-page: http://router/syscmd.asp
   • In input box enter: /usr/sbin/telnetd -l /bin/ash
   • Test if telnet server is working: telnet router
   • Note: this hack may not work on all firmware versions, I have tested it successfully on 2.21b.
2. Download flash files to router and flash:
   • Start telnet session on router. And run following commands:

     cd /tmp
     wget http://eol.ovh.org/3g-6200n/openwrt-ramips-rt305x-v22rw-2x2-squashfs-sysupgrade.bin
     wget http://eol.ovh.org/3g-6200n/mtd
     chmod a+x mtd
     ./mtd -r write openwrt-ramips-rt305x-v22rw-2x2-squashfs-sysupgrade.bin Kernel:RootFS
     

     If everything works as expected router after automatic reboot should be accessible via telnet at 192.168.1.1.
   • Note: I do not remember if mtd partition names used in mtd command are correct.
     To find the right ones please issue command cat /proc/mtd.

Notes

• mtd file is statically compiled version of mtd from openwrt sources for this platform.
• openwrt-ramips-rt305x-v22rw-2x2-squashfs-sysupgrade.bin file was published by lgolebio user on openrouter.info forum.
  As I understand it is slightly modified build of openwrt from trunk.
• In case of problems it should be possible to flash back to original firmware via tftp firmware restore method.
• This method was tested on firmware 2.21b available at Edimax Poland.
• My only contribution to this method is usage of telnetd/mtd to flash firmware.
  Everything else is thanks to users from openrouter.info forum, see Edimax 3G-6200N openwrt(PL) thread.