How to unbrick Belkin F5D8235-4 v2 (N+) router

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wkweksl
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Joined: 26 Feb 2011
Posts: 12

PostPosted: Wed Aug 24, 2011 10:26    Post subject: Reply with quote
jons wrote:
Did you set the network interface of the computer to static ip and use an ip on the same subnet and netmask as those you tested?

Yes I used a static ip on the same subnet.
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jons
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Joined: 24 Jan 2011
Posts: 49

PostPosted: Wed Aug 24, 2011 10:33    Post subject: Reply with quote
You could do it with a serial cable as some have stated in the other thread

http://sleclire.blogspot.com/2010/09/interfacing-belkin-f5d8235-4-v2000.html

Pretty cheap on ebay.
LOM
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Joined: 28 Dec 2008
Posts: 7046

PostPosted: Wed Aug 24, 2011 11:47    Post subject: Reply with quote
I've had a look at the boot loader code and there is no tftp support during the 1 second boot delay as there is for other routers.

Only way of starting a tftp transfer is by using a serial terminal.
wkweksl
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Joined: 26 Feb 2011
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PostPosted: Thu Aug 25, 2011 0:55    Post subject: Reply with quote
jons wrote:
You could do it with a serial cable as some have stated in the other thread

http://sleclire.blogspot.com/2010/09/interfacing-belkin-f5d8235-4-v2000.html

Pretty cheap on ebay.

Thanks for the link jons. May take it up at a later time. Any good ebayer to recommend and which cable to get?


Last edited by wkweksl on Thu Aug 25, 2011 0:57; edited 1 time in total
wkweksl
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Joined: 26 Feb 2011
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PostPosted: Thu Aug 25, 2011 0:57    Post subject: Reply with quote
LOM wrote:
Only way of starting a tftp transfer is by using a serial terminal.

Noted. Thanks for the heads up.
wkweksl
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Joined: 26 Feb 2011
Posts: 12

PostPosted: Thu Aug 25, 2011 3:22    Post subject: Reply with quote
Found this. Drivers from here? Sorry new to serial cable recovery.
LOM
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Joined: 28 Dec 2008
Posts: 7046

PostPosted: Thu Aug 25, 2011 4:51    Post subject: Reply with quote
wkweksl wrote:
Found this. Drivers from here? Sorry new to serial cable recovery.


A bit expensive but it is the right type. Here is another one:

http://cgi.ebay.com/Serial-Converter-USB-2-0-TTL-UART-6PIN-Module-CP2102-/160587864333?pt=LH_DefaultDomain_0&hash=item2563c8590d
wkweksl
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Joined: 26 Feb 2011
Posts: 12

PostPosted: Fri Aug 26, 2011 1:34    Post subject: Reply with quote
Thanks LOM, you've been a great help. Will pick one up and see how it goes.
scoobynut
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Joined: 13 Mar 2010
Posts: 5

PostPosted: Fri Aug 26, 2011 16:54    Post subject: Reply with quote
LOM wrote:
wkweksl wrote:
LOM wrote:
The bootloader has the ip address 10.10.10.123 and it expects a tftp file transfer from a computer with ip 10.10.10.3

Download the tftp client here:
http://www.dd-wrt.com/dd-wrtv2/downloads/others/tornado/Windows-TFTP/tftp2.exe


Thanks LOM but no response from the router. Anything else to try other than serial cable?


You could try to setup a real tftp server on your computer, tftpd32 by P.Jounin (google it), using the same ip addresses as I listed before.

tftpd32 can listen for a file request from the router and you will see the routers connection attempts (if there are any)in tftpd32's log window. The window will then also show you the filename being requested (example firmware.bin, uimage.bin) so that you can rename the firmware file to what the router expect to get.

You can also use tftpd32 in the same way as tftp2, to push a file onto the router, it may be that the boot loaders tftp routines can't detect a connection to tftp2 but is more happy with tftpd32.

Make sure any windows firewalls or antivirus progs are disabled and use a WinXP or Linux computer, Win7 takes so long time to detect that the ethernet link is up so you will have missed the short tftp windows of 1 second before the router tries to boot from flash.


The P.Jounin app was the first I tried - never got it to work Sad , but I couldn't disable my work antivirus and maybe that was blocking it. I know Mcafee has some stupid UDP / TCP blocking going on...
wkweksl
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Joined: 26 Feb 2011
Posts: 12

PostPosted: Thu Sep 08, 2011 10:13    Post subject: Reply with quote
Got the serial cable. Tried interfacing using putty but seem to get gibberish characters output. Unrecoverable brick?
LOM
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Joined: 28 Dec 2008
Posts: 7046

PostPosted: Thu Sep 08, 2011 10:30    Post subject: Reply with quote
Baudrate for F5D8235-4 is 57600, 8 databits, 1 stopbit, and no parity bit.
Gibberish output is usually wrong baudrate or missing ground connection.
Don't give up yet!
wkweksl
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Joined: 26 Feb 2011
Posts: 12

PostPosted: Thu Sep 08, 2011 12:04    Post subject: Reply with quote
Still no go with 57600 8N1. Blank screen. Only if I wriggle it a little, I get gibberish characters. Also, I noticed if the router is not powered, one of the leds (storage I think) will light up and my computer loses it's connection to the serial port.

Edit: After soldering a header, no response from router. Spamming Ctrl-C or space bar does not put the router into cfe mode. Any other suggestions?
zyhong
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Joined: 12 Dec 2011
Posts: 2

PostPosted: Mon Dec 12, 2011 19:13    Post subject: success story? Reply with quote
Anyone got the f5d8235-4 unbrick successfully with any means mentioned here?
zaubara
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Joined: 09 Nov 2011
Posts: 3

PostPosted: Thu Dec 29, 2011 1:45    Post subject: Reply with quote
Great - after installing the newest 18024 (which now had p910nd installed, ie. a WORKING printer server) which had strange disconnection issues (disconnected and reconnected every few minutes), I decided to return to the stable 16785 again... now it looks like it's bricked.
All it does is switch between no connection and no ip address.

So the only way to return it to working state is hoping for an RMA or a serial cable? :'(
theslightestofhand
DD-WRT Novice


Joined: 22 Jan 2011
Posts: 4

PostPosted: Tue Jan 31, 2012 1:33    Post subject: Permanently bricked? Reply with quote
Hi guys,

I have followed this thread, read up on serial connections using the CA-42 cable, and now I'm stuck.

I have connected my CA-42 to the routers board and run 3 different terminals (minicom, putty, Terminal by Br@y++) and the boot up seems to get stuck. I have posted a screenshot.



It seems like I am getting the correct stuff but then once the config_usbotg is run, something strange happens and I don't get any response afterwards.

Any thoughts?
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