Posted: Thu Jan 21, 2010 1:29 Post subject: MT-WR855N
I got my hands on a couple of unbranded 300Mbps Wireless Routers. I opened one of them and found a chip named RT3052F. To bad I don't own a decent digital camera, just my cell phone. LJ-M printed on the PCB reveals that it is fromLong Jiang Industri and M stand for Multilayer Printed Wired Boards.
There is no components for the USB port, no JTAG but probably a serial port to the left side of the Ralink SoC.
Specifications can be found on this homepage, and the model is MT-WR855N.
I did not test both units with DD-WRT, but will do that later.
I discovered something very strange. When I pressed the reset button on the DD-WRT unit, the speed raised to around 90-95 Mbps. It lasted until I plugged the power cord. When I reconfigured WDS after the reset, the speed went back to 65Mbps.
I logged in to the unit with telnet and issued the wget command to download the DD-WRT firmware for the Aceex NR22/Y router, then I issued the mtd_write command to flash my router.
Your may use the HEX editor and try to remove the dd-wrt flash image header and start from "0x27051956". The boot loader and upload.cgi may check this magic code.
Exactly, there is no downloadable firmware at all for this product. I took a backup of the original firmware with the cat command, but I don't know if it is useful. However, it was no problem when I upgraded with the Aceex NR22/Y firmware.
Your may use the HEX editor and try to remove the dd-wrt flash image header and start from "0x27051956". The boot loader and upload.cgi may check this magic code.
