I flashed build 14896 onto my TL-WR841ND v3.0 and it bricked.
I have got a PL-2303 chip based USB to Serial Converter. I found the pinout of male RS232 and it showed that pin 2 = RD, pin 3 = TD and pin 5 = GND.
So according to the guide above the pinout of P1
9 7 5 3 1
A 8 6 4 2
2 - Rx
3 - Tx
4 - Vcc (+3,3V)
5 – GND
I soldered the USB to Serial Converter pin 2(RD) to the router pin 3, the USB to Serial Converter pin 3(TD) to the router pin 2
and the USB to Serial Converter pin 5(GND) to the router pin 5
and finally I bridged R355 and R356.
Set up Putty to 9600 8-N-1 and NO flow controll (COM1). (115200 8-N-1-N didn't work either)
The serial runs at 115200 8N1 for v5. For v3.2 uboot starts 9600 and then kernel switches to 115200.
I figure my problem is the USB to Serial Converter. I measured 6.38V between the pin 3(Transmit Data) and pin 5(Ground) (RS232 DB9). I don't understand why not 3.3V or 5V.
My Siemens M35 cellphone data cable landed in the trash years ago. It would be great right now because it used 3.3V.
So I need to find the right TTL converter which is suitable for RX - TX - GND - +3.3V communication.
If I have any progress I'll let you know
The serial port runs at 115200 baud, 8 bits, no parity, 1 stop bit using ANSI terminal emulation. Levels are not RS232 voltage levels, but +3.3V TTL logic.
Use level shifter (Max232/Max3232/DS275 etc.) to correct this. Also a USB to serial phone cable will work in most cases.
A cable with a Prolific 2303 works fine. You have to short R356, if not, the TX will not going to work.
No it is not different - all the routers are using 3.3V TTL level signals.
You can not use the USB<->Serial cable that you buy in the computer shop, that one has RS232 signal levels.
You need a cable intended for TTL serial and not RS232 serial.I ordered a NOKIA USB Data Cable CA-42. I hope this is gonna work too.
I used a multimeter to check the voltages. The pinout of P1 is
9 7 5 3 1
A 8 6 4 2
2 - Rx
3 - Tx
4 - Vcc (+3,3V)
5 - GND
(Above the 1 there is a triangle)5 is Ground
I measured 3.29V on pin 4 and 3.29V or 0V on pin 3 0V on pin 2.
I think this is a pretty good sign there is still hope for recovery.What I did:
After I had gained access to the router with Putty (9600 8-N-1-N) and had had a working TFTP server you need to type 'tp'(without quotes) when "Autoboot in 1..." appear.
And you get this:
ar7100>
Now you can type commands.
So I typed in:
ar7100> printenv
got:
...
bootcmd=bootm 0xbf020000
serverip 192.168.1.169
routerip 192.168.1.10
...
I don't know if it's important or not but at this point I've changed my laptops ipaddress to 192.168.1.169Typed in:
ar7100>tftpboot 0x81000000 wr841n_v3.0_cut.bin (the file must be in the TFTP servers directory)
got:
...
Bytes transferred = 3932160 (3c0000 hex)
...
Typed in:
ar7100> erase 0xbf020000 +0x3c0000
ar7100> cp.b 0x81000000 0x9f020000 0x3c0000
ar7100> bootm 0x9f020000
AP93 (ar7240) U-bootYou now have one second to enter "tpl" (without the quotes) to get to the Uboot console prompt.
DRAM:
sri
#### TAP VALUE 1 = 9, 2 = 9
32 MB
id read 0x100000ff
flash size 4194304, sector count = 64
Flash: 4 MB
Using default environment
In: serial
Out: serial
Err: serial
Net: ag7240_enet_initialize...
No valid address in Flash. Using fixed address
: cfg1 0xf cfg2 0x7014
eth0: 00:03:7f:09:0b:ad
eth0 up
No valid address in Flash. Using fixed address
: cfg1 0xf cfg2 0x7214
eth1: 00:03:7f:09:0b:ad
ATHRS26: resetting s26
ATHRS26: s26 reset done
eth1 up
eth0, eth1
Autobooting in 1 seconds
Stuck at 130Mbps? Get 300Mbps
This violates regulatory requirements
1. Turn on PuTTY(or whatever you're using, use either SSH or Telnet)
2. Go to /etc/config
cd /etc/config3. Open wireless with vi (click 'i' to write)
vi wireless4. Below config 'wifi-device' 'radio0' add
option 'noscan' '1'5. option 'htmode' should be set either to HT40+ or HT40-(I've only tried HT40+)
option 'htmode' 'HT40+'6. Save and exit(click Esc and then write :wq and click Enter)
7. Restart wireless(first wifi down then wifi up) or just reboot the router
8. Enjoy your 300Mbps!
Wifi on/off toggle by QSS button
Found in WR741ND wiki page and coppied. It works on WR841ND too.
Simply create a new file called 01onoff in /etc/hotplug.d/button/
vi /etc/hotplug.d/button/01onoff
and copy these lines inside (remember to push 'i' for insert)
#!/bin/sh
[ "$BUTTON" = "BTN_1" ] && [ "$ACTION" = "pressed" ] && {
SW=$(uci get wireless.@wifi-device[0].disabled)
[ $SW == '0' ] && uci set wireless.@wifi-device[0].disabled=1
[ $SW == '0' ] || uci set wireless.@wifi-device[0].disabled=0
wifi
}
Save and exit
(esc :wq)
Basic configuration
1.) There is a bug in the switch driver in Backfire (10.03) that crashes the wan port. The switch driver was rewritten in 10.03.1, and this shouldn't be a problem in that release. The workaround for 10.03 is to modify the mtu on that port:
uci set network.wan.mtu=1400
uci commit network
Is the same a edit the file:
vi /etc/config/network
in the "config interface wan" add
option mtu 1400 |
Hardware
| Version | v3 | |||
|---|---|---|---|---|
| Architecture: | MIPS | |||
| Vendor: | Atheros | |||
| Bootloader: | U-Boot | |||
| System-On-Chip: | ? | |||
| CPU Speed: | 400 Mhz | |||
| Flash-Chip: | ? | |||
| Flash size: | 4 MiB | |||
| RAM-Chip: | ? | |||
| RAM size: | 32 MiB | |||
| Wireless: | ? | |||
| Ethernet: | ? | |||
| USB: | ? | |||
| Serial: | Yes | |||
| JTAG: | ? |
