[botterbloem]

Initially I thought I had succesfully flashed a Sitecom router with Ralink RT3050F @320mhz and 16mb sdram from Windows 7. The PCB has silkscreened YN700C-1.0 on it. After some searching it was obvious that this had to be an Senao/Engenius ESR 9753.

About the flashing:
I first had to find an USB-serial cable. I had this old Siemens data cable lying around, after opening it up there was an MS3303H chip (drivers were not easyly found, but found it: MS3303_USB_Driver.zip, on http://dc719.4shared.com/download/Fg4pbql_?tsid=20140822-065202-3eb094e2&dsid=7bcouj.f995017f8c4adb7c11a78867bb8c8218&sbsr=c441bc549cb076d8b7bc0d3046eb6a9e15b8af359d1f11c0&forDownloadHelper=true&lgfp=8000&dsid=7bcouj.f995017f8c4adb7c11a78867bb8c8218&isApi=true )on a PCB with silkscreened MKX23V2.0, found the pinout of it on a Russian site (http://siemensdca.ucoz.ru/publ/1-1-0-7): pin 2 GND, pin 3 TX, pin 4 RX. I soldered wires with connectors on these pins and I had an TTL capable JTAG Cable!

After that I soldered a few pins on the PCB of the router, which was really easy, on J14 the pins were marked with 1. GND, 2. TX, 3. VCC (not connected), 4. RX.

I connected the RX of the datacable to routers TX and TX of the datacable to the routers RX and GND to GND.

I putted in the LAN cable, gave my computer a fixed IP, started Hyperterminal and connected to the right com-port and booted, first there was no activity, after pulling out and reconnecting a few times there was this bootscreen, like in earlier posts. Pressed 2 for TFTP flashing and then Yes. Putted in an ip adress for the router and the server/computer. I used the TFTPD32 by Jounin program to serve the firmware.bin file found on dd-wrt.com by searching for ESR9753. The program flashed and the router rebooted with DD-WRT on it. The LED's on the router don't work, but the rest looks like it is functioning well.

UpdateI bricked the unit... By default the firmware flash trough TFTP is written by this version of U-boot to BFC50000. But at the same time the unit boots from BFC40000. So after flashing and rebooting the unit is bricked... Debricking will not work by using TFTP flash upload... (option 2 of the menu). I had to use sercomm to upload IP1006SRv1.bin (found with winrar in WBR-6002(1.00.13_HW-1)_2010-07-19.img). Then a few things on the unit are possible again. But of course not flashing it to DD-WRT... Therefore first the settings must be adjusted in U-boot to flash by TFTP correctly, and I don't know how...