Bricked Belkin F7D8302 v1 JTAG !waiting for sollution!

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Pied Piper
DD-WRT User


Joined: 18 Sep 2010
Posts: 499
PostPosted: Wed Mar 23, 2011 18:05    Post subject: Reply with quote
Sketcherz wrote:
Peabody wrote:
The Jtag article in the wiki fully explains how to make a jtag cable.

When was the last time you looked at the wiki for that information?

I have noticed in a few threads people have said certain things are missing form the wiki now.

I am looking for the DB25 conections.

the best picture I could find (not in the wiki) was something that redhawk posted.



EXACTLY the same picture as is linked in the wiki:

JtagWiki wrote:


A jtag cable can be bought off ebay, or made very inexpensively. Here is a picture of how to make one:[1]

Here is additional information:

* JTAG-Adapter

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Sketcherz
DD-WRT Novice


Joined: 08 Mar 2011
Posts: 37
PostPosted: Sat Mar 26, 2011 3:45    Post subject: Reply with quote
Pied Piper wrote:
Sketcherz wrote:
Peabody wrote:
The Jtag article in the wiki fully explains how to make a jtag cable.

When was the last time you looked at the wiki for that information?

I have noticed in a few threads people have said certain things are missing form the wiki now.

I am looking for the DB25 conections.

the best picture I could find (not in the wiki) was something that redhawk posted.



EXACTLY the same picture as is linked in the wiki:

JtagWiki wrote:


A jtag cable can be bought off ebay, or made very inexpensively. Here is a picture of how to make one:[1]

Here is additional information:

* JTAG-Adapter



WIKI

D-SUB-Plug JTAG
Pin 2 -------[100Ohm]------- Pin 3
D0 TDI

Pin 3 -------[100Ohm]------- Pin 9
D1 TCK

Pin 4 -------[100Ohm]------- Pin 7
D2 TMS

Pin 13 -------[100Ohm]------- Pin 5
Select TD0

Pin 20 ---+------------------ Pin 6
GND | GND
|
Pin 25 ---+
GND


The other one shows pins 18-25
Does 20-25 vs 18-25 matter?

"Exactlly"?
Or are there a few of these?
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Sketcherz
DD-WRT Novice


Joined: 08 Mar 2011
Posts: 37
PostPosted: Sat Mar 26, 2011 4:44    Post subject: Reply with quote
==============================================
EJTAG Debrick Utility v3.0.1 Tornado-MOD
==============================================

Probing bus ... Done

Instruction Length set to 5

CPU Chip ID: 11111111111111111111111111111111 (FFFFFFFF)
*** Unknown or NO CPU Chip ID Detected ***

*** Possible Causes:
1) Device is not Connected.
2) Device is not Powered On.
3) Improper JTAG Cable.
4) Unrecognized CPU Chip ID.
-----------------------------------------------------


Ohm'd connections = approx. 100ohm

I used the wiki connections.
I measured the cable for near 100 ohm

I have continuity from bottom of board to head pins
I do not see (tested for as well) shorts.


I am guessing this thing is toasted?
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Sketcherz
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Joined: 08 Mar 2011
Posts: 37
PostPosted: Sat Mar 26, 2011 5:19    Post subject: Reply with quote
I have the DB25 male pins 20-25 connected together and the grnd on the router connected to these (without a resistor)

Do I need it to be 18-25 connected?

wiki jtag cable guide says 20-25

Which do I use?

Does it make a difference?
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fggs
DD-WRT Guru


Joined: 28 Jan 2008
Posts: 1741
PostPosted: Sun Mar 27, 2011 11:48    Post subject: Reply with quote
To make jtag cable you will have to see diagram as the back of male DB25 connector, then solder according it and you will be fine. And yes, it makes difference.
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Sketcherz
DD-WRT Novice


Joined: 08 Mar 2011
Posts: 37
PostPosted: Sun Mar 27, 2011 18:45    Post subject: Reply with quote
fggs wrote:
To make jtag cable you will have to see diagram as the back of male DB25 connector, then solder according it and you will be fine. And yes, it makes difference.


Ty

The 20-25 shorted pins on the back of the db25 did not work.

I am waiting for a tool Tornado has linked to on his profile.

I had made a cable using cat5e cable but I will just wait for this tool so I dont make too much waste.

TY for your input.
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nos_com71
DD-WRT Novice


Joined: 15 Dec 2011
Posts: 8
PostPosted: Thu Mar 15, 2012 20:11    Post subject: Reply with quote
Sketcherz wrote:
==============================================
EJTAG Debrick Utility v3.0.1 Tornado-MOD
==============================================

Probing bus ... Done

Instruction Length set to 5

CPU Chip ID: 11111111111111111111111111111111 (FFFFFFFF)
*** Unknown or NO CPU Chip ID Detected ***

*** Possible Causes:
1) Device is not Connected.
2) Device is not Powered On.
3) Improper JTAG Cable.
4) Unrecognized CPU Chip ID.
-----------------------------------------------------


Ohm'd connections = approx. 100ohm

I used the wiki connections.
I measured the cable for near 100 ohm

I have continuity from bottom of board to head pins
I do not see (tested for as well) shorts.

I am guessing this thing is toasted?





it written in version 3.0.1 support bcm 4716 ,while 4717 and 4718 r not included in support. may be the new version support them .
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lowi88
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Joined: 25 Nov 2012
Posts: 1
PostPosted: Sun Nov 25, 2012 15:46    Post subject: Reply with quote
nos_com71 wrote:


it written in version 3.0.1 support bcm 4716 ,while 4717 and 4718 r not included in support. may be the new version support them .


I have a Belkin PlayMax router (F7D4301) with BCM4718A. I could debrick this router successfully with Tjtag 3.0.2.1 and dlc5 cable.

The processor was identified by Tjtag as BCM4716 rev1.
Flash (MX29LV640EBTI-70G) was not automatically detected.

With the following switches & options I could successfully erase the NVRAM:

tjtag3 -erase:nvram /byte_mode /fc:160 /cable:dlc5

note: without the /byte_mode switch, the erase did not work.


.... maybe this will also work with F7D8302.
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ian5142
DD-WRT Guru


Joined: 23 Oct 2013
Posts: 2319
Location: Canada
PostPosted: Fri Sep 12, 2014 15:11    Post subject: Bricked F7D8302 Reply with quote
I bought a TUMPA, TIAO USB JTAG device. I have tried to get the right connections but I think my problem is I don't know which pin is Pin 1 on the router. Is it the Square one?

Also, don't give me a lecture on don't use a USB Jtag device. I do not have access to a parallel port, so this was the only option.
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hit.alfa
DD-WRT Novice


Joined: 03 Feb 2018
Posts: 1
PostPosted: Wed Feb 07, 2018 23:25    Post subject: Reply with quote
lowi88 wrote:
nos_com71 wrote:


it written in version 3.0.1 support bcm 4716 ,while 4717 and 4718 r not included in support. may be the new version support them .


I have a Belkin PlayMax router (F7D4301) with BCM4718A. I could debrick this router successfully with Tjtag 3.0.2.1 and dlc5 cable.

The processor was identified by Tjtag as BCM4716 rev1.
Flash (MX29LV640EBTI-70G) was not automatically detected.

With the following switches & options I could successfully erase the NVRAM:

tjtag3 -erase:nvram /byte_mode /fc:160 /cable:dlc5

note: without the /byte_mode switch, the erase did not work.


.... maybe this will also work with F7D8302.



I have the same router, would you please post a photo about the connection on the router board (the jtag connection) and the cable diagram? I am trying to get it to work but no success.


Thank you!
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ian5142
DD-WRT Guru


Joined: 23 Oct 2013
Posts: 2319
Location: Canada
PostPosted: Thu Feb 08, 2018 4:37    Post subject: JTAG Reply with quote
The 14-pin unpopulated pads should be JTAG, I am not sure though, it is either that or the 10 pads (less chance).
https://wikidevi.com/wiki/Belkin_F7D8302
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