unknown flash type please help

[nadum35]

Copyright (C) 2010,2011,2012
USB JTAG NT 0.47
Target: SB6120
-flshdct 0
Unknown flash type!
Report these values http://www.usbjtag.com/vbforum ff,ff,ff

Please help I just bought usbjtagnt and tryingi to back up flash but it always stop there saying Unknown flash type. Could someone please help as I have checked connection with test clip and it looks fine???
Many thanks in advance.
G

[usbbdm]

Check your soldering. Especially the ISP pin. Make sure the connections are correct.

[nadum35]

Thanks for quick response. I have checked all connections as a test clip connection and isp. All lights are on as isp is connected all the lights off. Any suggestions? Regards

[buzzybuzzard]

6120

Pinout
jtag chip
1--red-trst isp back of board
2--yel--gnd--10 gn
3--pur--tdi--15st
4--gn
5--org--tdo--8so
6--gn
7--na
8--gn
9--blu--tck--16 sck
10-gn--
11-grn--reset-7 cs
12-na
13-na
14-na

5---11
org GRN
8---7 6 5 4 3 2 1
ISP back of chip to jtag pin1
9 10 11 12 13 14 15 16
--YEL----------PUR BLU
---2------------3---9

[usbbdm]

What cable do you use? The once side cable is not colored from US, Pin 1 is also printed on the label.
If connection is correct when power on the modem (with JTAG connected). The modem should have NO light. If you see modem has light flashing your connection is NOT right.

[lafraga]

usbbdm is 100% right i would recomend you to check all the connections because a have had a similar problem with my dpc3000 more than once and it has always been a connection problem

[nadum35]

Thanks for your responses. Yes when connected by clip there is light up then connected isp all the lights are off so this is correct. By reading through forum posts, the isp should give between 3.3v and 5v when measured and I measured mine is 1.94v only but the modem boot and run fine by the original fw. is this needed to look into? if I use alternative power from batery up to 5v would burn the chip? Regards

[usbbdm]

When use ISP method, you MUST use the stock 12V power supply and then simply connect the ISP. The modem then listen the command from JTAG NT.