Bricked Encore ENHWI-N3 (Senao ESR9753) changing uboot,JTAG?

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pilber
DD-WRT Novice


Joined: 27 Aug 2012
Posts: 18

PostPosted: Wed Oct 17, 2012 14:31    Post subject: Bricked Encore ENHWI-N3 (Senao ESR9753) changing uboot,JTAG? Reply with quote
This is cross posted in Ralink SoC based hardware topic:
http://www.dd-wrt.com/phpBB2/viewtopic.php?p=718166

Hello
I have two of these routers. I have soldered serial headers and connected to the serial console with both.

I managed to install ddwrt on one of them following this topic:
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=54802

When I was to start with the second one, I realized that its boot loader (U-Boot) version was different and lacked of option 4 (Entr boot command line interface). It doesn't show it nor respond by pressing 4.

I needed to do some test at boot command line, so after doing some prudently research I took courage and rewrote mtd0 partition with mtd0 of first router (same router model and SoC - identical PCB at first look), using originals firmware's Flashw tool. I preserved intact the other partitions Config and Factory. Instantaneously after restart all lights gone off except the green internet light with very low intensity, and it didn't work again.

Previously I have backed up all partitions of original firmware including boot loader.

Is it possibly to use JTAG with this unit to rewrite original boot loader? Does somebody managed to use open source software JTAG tools and homemade parallel port JTAG cables with Ralink SoC?

The U3 socket identified in the first picture of the topic previously mentioned http://www.dd-wrt.com/phpBB2/files/dscf0002_168.jpg has similar characteristics of a standard 14 pin JTAG connector (pins 2, 4, 6, 8 and 10 connected to GND, 14 to PWR-VREF like http://www.jtagtest.com/pinouts/ejtag). Can somebody confirm this?

Thanks!
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fvergniaud
DD-WRT Novice


Joined: 04 Oct 2013
Posts: 2

PostPosted: Fri Oct 04, 2013 5:39    Post subject: Re: Bricked Encore ENHWI-N3 (Senao ESR9753) changing uboot,J Reply with quote
did you tried with JTAG?, with serial my router only send

U-boot Ver:1.0.1.2 2009/09/24
Board: Ralink APSoC DRAM: 16 MB 1*16 MB

and stop.
pilber
DD-WRT Novice


Joined: 27 Aug 2012
Posts: 18

PostPosted: Wed Dec 17, 2014 3:51    Post subject: Bricked Encore ENHWI-N3 (Senao ESR9753) changing uboot,JTAG? Reply with quote
Follow up on http://www.dd-wrt.com/phpBB2/viewtopic.php?p=938584#938584
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