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[routerbox]

Hi
All
Hope everyone is have a great time.
I need some help please

I have a HG635 router that has randomly bricked itself
I have tried resetting it several times and keeping the rest button pressed in for a long time but no lights flash
I am only left with the power light on.
The wireless does not work

I have connected the router to My laptop by ethernet cable by static IP
When i go to the router IP i get a page asking for the firmware image
I read here that there is an open source firmware that i downloaded and used the image file
HG635v1.04t_multicast_with_multicfg_pack.bin
It flashed it and the broadband light flashed, rebooted but got to the same page asking for a firmware update

Please can someone help me fix this
I am new to the router moding scene

Thanks so much in advance

[Alex Atkin UK]

Hmmm, that's not a good sign, I wonder if the flash memory has failed.  I know I had a router years ago that did the same and flashing the firmware did fix it.

Have you tried a couple of times to see if it will stick?  Unfortunately without opening it up and using a serial connection I don't think we can see if its triggering an error when flashing the firmware.

[tubaman]

The HG635 (assume this is what you have from the firmware you mentioned?) is a old TalkTalk device, but was one of their better ones.
If it successfully flashed the open source firmware but still fails then it does unfortunately sound like it might be terminal.
 

[Jaggies]

The old BT Business Gateways were notorious for failing power supplies, and the symptoms are much as described - only power light on. If you have a matching power supply from another device, try a swap.
Bear in mind the polarity, output voltage and current need to be the same.

[routerbox]

Hmmm, that's not a good sign, I wonder if the flash memory has failed.  I know I had a router years ago that did the same and flashing the firmware did fix it.

Have you tried a couple of times to see if it will stick?  Unfortunately without opening it up and using a serial connection I don't think we can see if its triggering an error when flashing the firmware.

Hi
Thanks for the reply
I did  try a few times but did no luck
I have it open
can i connect a uart adapter to this ?

[routerbox]

The HG635 (assume this is what you have from the firmware you mentioned?) is a old TalkTalk device, but was one of their better ones.
If it successfully flashed the open source firmware but still fails then it does unfortunately sound like it might be terminal.
 

Hi
Yes it is HG635,  corrected the mistake

[Moderator edited to insert the correct quotation.]

[routerbox]

The old BT Business Gateways were notorious for failing power supplies, and the symptoms are much as described - only power light on. If you have a matching power supply from another device, try a swap.
Bear in mind the polarity, output voltage and current need to be the same.

I have tried with another power supply but same thing

[Moderator edited to insert the correct quotation.]

[Alex Atkin UK]

I have tried with another power supply but same thing

[Moderator edited to insert the correct quotation.]

As in tried flashing using that PSU?

[routerbox]

As in tried flashing using that PSU?

Yes. did not make a diffirence
The broadband light does flash when being programmed and when it reboots the 192.168.1.1 webpage goes to the upload page asking for the firmware image

[Alex Atkin UK]

Only other thing I can think of is check any capacitors on the routers PCB.  I had to replace them on my ECI, haven't checked the HG612.

[routerbox]

Only other thing I can think of is check any capacitors on the routers PCB.  I had to replace them on my ECI, haven't checked the HG612.

I checked the caps
Dont see any bulging caps

Can I JTAG into this model

[burakkucat]

Can I JTAG into this model

Are the header pins (or the unpopulated solder pads) present on the PCB? If yes then "yes" is the answer to your question!

[routerbox]

Are the header pins (or the unpopulated solder pads) present on the PCB? If yes then "yes" is the answer to your question!

Thanks for the reply
Cant see any header pins or pads
some have said on the forum that this has been locked down

[burakkucat]

Cant see any header pins or pads

That is unfortunate. I can't think of any other way of recovering the device. 

[Edited to correct a typo.]

[mofa2020]

On openwrt this router is stated as a NO JTAG connection available but serial is available although on the 2 pics of router's PCB I can not find any obvious serial connector.

https://openwrt.org/toh/huawei/hg635