press the hard-switches until all the LEDs open together.it will restore.maybe it will help you!

Hi,

That seems an hardware problem requiring a RMA, but before, I suggest to test another compatible PSU...

dawnman wrote

press the hard-switches until all the LEDs open together.it will restore.maybe it will help you!

I don't know what you mean by "hard-switches", if you refer to the reset button, I've tried numerous ways to reset the device.

Hi,
That seems an hardware problem requiring a RMA, but before, I suggest to test another compatible PSU...

Tested with another compatible PSU , ... the same result.
I can't (easily) send back the unit because it was bought from another country and the postal costs are about a third of his price.

Thanks for the replies
If is a hardware problem why the constant blink ? I suspect it is a BIOS error somehow, the router has functioned continuous for months without a restart/reboot.
A friend of mine put this clip on youtube, the symptoms can be seen there.

[video=youtube;N539Oei5Ezc]http://www.youtube.com/watch?v=N539Oei5Ezc[/video]

If it is responding to Ping within the first seconds when you switch it on, the bootloader is not dead.
You can try to load the firmware through FTP...

no ping (the annoying blinking is starting right away)
looking at him, reminds me of a AC digital clock who was reset by an power failure, and now is flashing blind waiting for input

After a few months, took a trip to Germany and with that occasion I replaced the unit with new one.
The hardware version is (v1 00000000) and model version 1.6. I think that the old one was not (v1 00000000) but something like (v1 xx000000).
Also the new one is with green LEDs and not blue and is working fine for 3 months now.

Problem solved by replacing the product and not by finding a solution.

I think i've found a solution, but you won't have the original firmware.

On OpenWrt there is a de-brick guide:
http://wiki.openwrt.org/toh/tp-link/tl-wdr4300#de-brick_or_oem_installation_using_the_tftp_recovery

The only steps necessary for me where:
1. power off the device, hold the reset button and power on the device.
2. change my ip to 192.168.0.66 and gateway to 192.168.0.86
3. download the latest image from OpenWrt and rename it to wdr4300v1_tp_recovery.bin
4. Install TFTP32 ( http://tftpd32.jounin.net/), set the directory to the bin file and disable my firewall.

Then the TFTP32 program showed dialogs that it was trying to send the image a dozen times.
Finally after a minute or 3 one of the dialogs actually showed 100% progress.
That way the router was functional again.

You are right @ikbentomas it was problem with lost firmware. Router has only bootloader.