Cisco E900 All Lights On, Bricked(?)

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safinqq
DD-WRT Novice


Joined: 20 Nov 2022
Posts: 3

PostPosted: Wed Nov 23, 2022 4:12    Post subject: Reply with quote
the serial adapter connection

already try swap the tx/rx

which is follow :
https://domonkos.tomcsanyi.net/?p=398
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dale_gribble39
DD-WRT Guru


Joined: 11 Jun 2022
Posts: 1899

PostPosted: Wed Nov 23, 2022 4:32    Post subject: Reply with quote
AlexUrbRad wrote:
Malachi wrote:
You don't hook up vcc. The guide says hook up ground, tx and rx.
Like I've said twice now, if after connecting the rx and tx wires together that are coming off of the adapter and nothing shows in putty after typing, then you have a bad adapter or putty is setup wrong.


This is my putty screen


https://ibb.co/gbJCb7

it generates one of those blocks every time I power the router up. Ctrl C does not work.


Sorry I decided to continue with this post. thank you for helping.
I believe the bootloader is gone. Do you think it would be possible to use the jtag to flash a new boot loader on? do you know where I could get the file

This isn't a bootloader issue, it's bad connections OR bad PuTTY configuration discussed in the USB to TTL Tips - HOW TO FIX Garbage/Garbled PuTTY output post or serial recovery wiki.

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safinqq
DD-WRT Novice


Joined: 20 Nov 2022
Posts: 3

PostPosted: Wed Nov 23, 2022 5:36    Post subject: Reply with quote
dale_gribble39 wrote:

This isn't a bootloader issue, it's bad connections OR bad PuTTY configuration discussed in the USB to TTL Tips - HOW TO FIX Garbage/Garbled PuTTY output post or serial recovery wiki.


thanks for your information. it's usefull. i have marked it.
but it's same after i enable vt100 in putty.
And it's only 1 garbled character. should it be long content if ttl output is right not only 1 character? even if it's garbled.
Magar
DD-WRT Novice


Joined: 20 Dec 2023
Posts: 2

PostPosted: Wed Dec 20, 2023 14:44    Post subject: Reply with quote
Hello all!

I've been using DD-WRT (an old version) with E900 router for years, with no problem. When I tried to update DD-WRT version a few days ago, the router crashed. At this time, I still could have a stable PuTTY connection (throug a MAX232-based module to convert TTL to RS232 voltage signals) and I could have CFE prompt in PuTTY terminal.

With all set up and after a few tries to reload the firmware and release a "go" command to the CFE, the router became frozen in the same state described in this topic: all leds remains dimed, no response to reset switch, no management mode possible, all ethernet ports died, AND THE SERIAL COMMUNICATION DIED TOO.

So, I confirm that, at least im my case, when dd-wrt crashes on this router and all leds are frozen and dimmed, the serial port becomes unusable, unfortunately.

If someone have a solution to this issue, please post a reply.

Regards!
kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 14125
Location: Texas, USA

PostPosted: Wed Dec 20, 2023 16:37    Post subject: Reply with quote
Did you do an 'nvram erase' from the CFE prompt as per serial recovery? And what firmware were you 'upgrading to'? What file did you use?

https://wiki.dd-wrt.com/wiki/index.php/Linksys_E900

https://wiki.dd-wrt.com/wiki/index.php/Serial_Recovery

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Magar
DD-WRT Novice


Joined: 20 Dec 2023
Posts: 2

PostPosted: Wed Dec 20, 2023 18:21    Post subject: Reply with quote
kernel-panic69 wrote:
Did you do an 'nvram erase' from the CFE prompt as per serial recovery? And what firmware were you 'upgrading to'? What file did you use?

https://wiki.dd-wrt.com/wiki/index.php/Linksys_E900

https://wiki.dd-wrt.com/wiki/index.php/Serial_Recovery


Hello there, thanks for your attention!

The problem started on the last week when I updated the firmware to the newest release available in the dd-wrt site: dd-wrt.v24-44715_NEWD-2_K2.6_mini-e900.bin

It worked for some time (3 or 4 days). Then the router became down.

Then I made the serial link functional and obtained the CFE prompt.

About your questions:

Yes, I confirm I ran "nvram erase" command with output status 0.
Then, I tried to load some firmware using a tftp server from my computer following instructions in:
https://wiki.dd-wrt.com/wiki/index.php/Serial_Recovery

The file I put available in tftp server was an old version that worked ok for many years: dd-wrt.v24-21061_NEWD-2_K2.6_mini-e900.bin
At that time, I could ping from the router (192.168.1.1) to the tftp server (192.168.1.2) but when I ran the command "flash -ctheader : flash1.trx" as indicated in that page, no transfer occured at all.

Then I tried the command "tftpd" at CFE prompt (as suggested in that link) trying to make the router act as a server and put a ftp client in the PC side, but another error occured (something like "command not found").

Then, after unsuccessful other attempts to reload the old firmware, I ran the command "go" just to see if the management mode could be called after that (and if so I could transfer the firmware through http interface).

After that, the router became completely stuck.

Then I did a power cycle. The router presents dimmed leds and no function at all since then (no activity in serial port and ethernet ports).

I followed your links above:

https://wiki.dd-wrt.com/wiki/index.php/Linksys_E900
Tried 30/30/30 hard reset but it took no effect.

Your second link is the same I followed before.

Thanks!
kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 14125
Location: Texas, USA

PostPosted: Thu Dec 21, 2023 1:25    Post subject: Reply with quote
I can see right now we're going to have to rectify your shortcuts. 44715 is not supported, the router database is not current. And unless it's been fixed, there is possibly still the LAN ports issue on the E900. Not to mention, when you serial recover, you use a TFTP client, not server on your PC to 'put' the file. Issuing a go command without a file being already pushed was a huge mistake. Please take some time to do some more reading.

Announcement: Broadcom forum FAQ – README

New Build - 12/18/2023 - r54545

https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/

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