Hello
After having some freezes on my P-2812HNUL*-F1 and because of some privacy concerns about the TCP port 50805 being reserved for TR069 connections I decided to install Openwrt but I got stuck at the factory U-Boot step
1- I made the cable by soldering the pins of USB-to-RS232 dongle (brand name: FTDI, Vendor ID: 0403, Product ID: 6001) (2nd RX, 3rd TX, 5th pin: GND) I plugged the dongle to my WinXP laptop and installed its drivers. Dongle appeared as COM10 in device manager.
2- I installed both Termite and Putty to use as terminal. I first opened Termite , it automatically detected the dongle as connected on COM10
3- I short circuited the R17 bridge by a screwdriver and powered up the router waited for a second or two and released the screwdriver.
4- Termite stopped running and closed itself.
5- I tried the same with Putty, selecting Serial as connection. Putty went on running but crambled characters came up. Here's one sample screenshot: i . hizliresim. com / Ja5jDj.png
Those crambled characters come up whether I short or not. On my previous try those crambled chars covered the whole screen.
In 2012 I tried to resque my bricked Zyxel 661HW-61 using the same USB2Serial dongle (which Terminal I used I can't remember now) and I had got a similar result and I could not resque it, that's when I bought this one, P-2812HNUL-F1.
How can I install Openwrt on this modem? Thank you.
* (L is documented by ZyXEL as: L Models users need a splitter to use the FXO port so I guess it's not something to alter the installation process)