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  Topic: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
alins75

Replies: 48
Views: 45355

PostForum: Broadcom SoC based Hardware   Posted: Fri Apr 18, 2014 6:26   Subject: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
Well, the serial recovery can be done using an USB adapter.
For this jTAG cable you will need a parallel port.
The serial recovery is one thing that I recommend you to try first. In most cases will ...
  Topic: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
alins75

Replies: 48
Views: 45355

PostForum: Broadcom SoC based Hardware   Posted: Thu Apr 17, 2014 7:51   Subject: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
My E4200 remains bricked after a case of flashing the wrong firmware. Can it be fixed via a serial cable or is a JTAG cable needed? Also, could you post pics of the cables/equipment you used and links ...
  Topic: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
alins75

Replies: 48
Views: 45355

PostForum: Broadcom SoC based Hardware   Posted: Thu Apr 03, 2014 19:41   Subject: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
First turn of the router for a few seconds.
Then immediately after turning it on type the command from step 1. Then go to step 2 to erase cfe or to step 4 to erase the nvram.
Whenever it hangs, sto ...
  Topic: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
alins75

Replies: 48
Views: 45355

PostForum: Broadcom SoC based Hardware   Posted: Thu Apr 03, 2014 19:12   Subject: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
brjtag -erase:custom /cable:dlc5 /fc:120 /noreset /nobreak /instrlen:5 /wx8 /verbose /window:1c000000 /start:1cff0000 /length:10000

This is what you need to use to erase nvram. This is what I used ...
  Topic: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
alins75

Replies: 48
Views: 45355

PostForum: Broadcom SoC based Hardware   Posted: Thu Apr 03, 2014 18:53   Subject: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
At this point you can probably stop the brjtag and try the command in the previous post to erase the kernel.
Next try again steps 1 to 7. Shouldn't take more than 30 min.
You can lose the verbose, ...
  Topic: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
alins75

Replies: 48
Views: 45355

PostForum: Broadcom SoC based Hardware   Posted: Thu Apr 03, 2014 18:38   Subject: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
Well, I don't know what to tell you, but I think eventually will work.

Anyway performing all the steps (1to7) didn't take more than 30 min.
Erasing the kernel was pretty quick too...
I did not tr ...
  Topic: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
alins75

Replies: 48
Views: 45355

PostForum: Broadcom SoC based Hardware   Posted: Thu Apr 03, 2014 18:01   Subject: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
But why do you need to erase kernel?
After erasing the nvram the serial recovery should work.
Alternatively, you can try erasing the kernel using erase: custom
Something like this:
brjtag -erase: ...
  Topic: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
alins75

Replies: 48
Views: 45355

PostForum: Broadcom SoC based Hardware   Posted: Thu Apr 03, 2014 17:46   Subject: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
Before trying to erase, can you try to make a backup of the NVRAM, just to make sure the brjtag works?

Try step 1, then step 7.
You should get a NVRAM, corrupted probably, but looking close to wh ...
  Topic: Linksys E4200 Serial/JTAG Port Guide
alins75

Replies: 31
Views: 65061

PostForum: Broadcom SoC based Hardware   Posted: Wed Mar 12, 2014 12:07   Subject: Linksys E4200 Serial/JTAG Port Guide
This router is getting dust in my office for nearly 2 years and this winter I thought I give it a try again. I bricked after playing with some VLAN settings. The error was the continous boot loop expl ...
  Topic: bricked e4200
alins75

Replies: 48
Views: 33536

PostForum: Broadcom SoC based Hardware   Posted: Wed Mar 12, 2014 11:58   Subject: bricked e4200
My E4200 got bricked the same way.
Unfortunately for me, the serial recovery did not work. After the serial recovery I went straight to the continuous boot loop.

I had to use the JTAG to recover. ...
  Topic: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
alins75

Replies: 48
Views: 45355

PostForum: Broadcom SoC based Hardware   Posted: Mon Mar 10, 2014 13:59   Subject: Re: HOWTO - unbrick Linksys E4200 v1 with JTAG
As I said, serial recovery didn't work. I had to use the unbuffered JTAG cable.

Erasing the NVRAM did not help - the CFE was corrupt. The E4200 was still in the continuos CFE boot loop.
Erasing th ...
  Topic: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
alins75

Replies: 48
Views: 45355

PostForum: Broadcom SoC based Hardware   Posted: Mon Mar 10, 2014 11:36   Subject: [SOLVED] HOWTO - unbrick Linksys E4200 v1 with JTAG
Hi everybody,

This is a small HOWTO that you can use to unbrick the E4200 using JTAG. See details below.

I have managed to brick my E4200 after flashing dd-wrt.v24-23082_NEWD-2_K2.6_XXX-nv60k.bi ...
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