I took apart old Edimax SmartPlug (model SP-1101W) to find out that the brain of the device is Ralink RT5350F chip conviniently placed on removable module board: Ralink board top

The board has two rows of 14 pins (28 pins total) distanced acording to raster 0.2'' :

ralink board bottom

Model description "ST&T W5350.2" text is visible but I couldn't find specification or pinout. The bent (by me, to make some tests) pins are not connected to the main board, that looks like this: Edimax main board

On the main board I can see three solder/testing pads: GND, 3.3V and 12.0V and an unused row of 6-pin connector - I'd guess that that's the programmer interface, but I don't know what type.

My goal is to upload/burn custom image to the Ralink board, for example OpenWRT (in theory it should run on RT5350). I don't have enough experience to plan the entire process. I'm looking for some help:

  • How to discover pin functions? Maybe someone experienced could guess something from the conventions used in board design?
  • How to find UART TX and RX pins? Maybe the current Edimax software exposes something on the Serial port. I had some experience with this product and I can say that it is not well secured, so it is poosible that some software console will be available over Serial port.
  • How to check if there is any bootloader allowing to upload a new image?
  • How to burn new image using some low-level programmer device (what do I need?)?
  • Look up 'HLK-RM04' it is the same
    – James
    Jun 15 at 0:17


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Browse other questions tagged or ask your own question.