Hi, I attached serial console to watch router's booting. First I unplug the serial and the power supply. Second I plug the router power and all leds light like every time and remains only to light power led, no other leds, I tried reset button but nothing. It putty there are no serial output after turn on. The router was not bricked and flashed with r23838 > working OK. Any suggestions ? I tried 2 different PCs. Does the router die ?

Thanks !

I know that is openwrt forum but I use dd-wrt. I want to save my router no matter if it is dd-wrt or openwrt firmware installed.

you DID NOT connect all 4 cables from usb - serial including VCC pin to router, right?

Connection is:

Tx-Rx
Rx-Tx
GND-GND

putty -> 115200, 8n1, none flow control

Seems that flash chip is dead. I need programmer and new chip. Please give some scheme of programmer to USB interface.

With serial console connected to the router and Putty on, unplug router adapter and plugin again. I have it the same issues with wr740 v4.27 only power led an no communication in putty. Works only if unplug an plug back power adapter. I use USB PL2303 To RS232 TTL

No effect. Seems that the cpu become hot after some minutes. The router was not bricked and run dd-wrt firmware After power on the PC would try to get ip, right ? There is not try to get ip, I try to set static but nothing. I think that the router have bad cpu so use my warranty and wait to see what happenes.

Can you tell me some words about version 9 and especially U-boot recovery mode ?
Did you brick your 740 and use serial interface ?

Also thanks for posting

(Last edited by Experimentator on 6 Jul 2014, 15:31)

Yes I brick my WR740N v4.27 after power failure when try to put back original firmware. For unbrick I used this

http://www.ebay.com/itm/New-PL2303-USB- … 0682850512

Now I have dd-wrt on it.

LE. On dd-wrt website you router is supported.

LE2. For WR841N you need to plug in WAN and set ip to your network card 192.168.1.1

(Last edited by xxvirusxx on 6 Jul 2014, 19:43)

1. What about if there is a power failture when update official with boot in name (update u-boot) ?
2. Is it possible to corrupt ART partition while update dd-wrt to openwrt or openwrt to dd-wrt or both to stock ?
3. What will be the result if you use the newest official firmware on the first bootloader release for example ? Does the router boot without problems any time ?
4. Can you erase bootloader and art partition with dd-wrt/openwrt and how ?

Thanks !

(Last edited by Experimentator on 6 Jul 2014, 20:16)

2.3.4. I don`t know. I am not an expert

Thanks anyway. Appreciate your time to help! There are some experts browsing this forum. Glad they will help when read my questions