immi803
DD-WRT Novice
Joined: 17 Mar 2018
Posts: 20
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 Posted: Tue Mar 20, 2018 13:38 Post subject: |
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| wab wrote: | Hi everybody,
this my first time ever to participate in the forum and I wanted to share my experience and take the opportunity to thank everyone for their help.
I have been using ddwrt for a long time, but eventually I managed to brick my router because I got lazy and didn't do my home work before the upgrade.
So I have E4200v1 router running dd-wrt.v24-31924_NEWD-2_K3.x_mega-e4200.bin and for some reason https was not working (I have tried different releases), and last week I found a couple of new releases and decided to go for the latest (I know that newer is not always good) 
Once rebooted, the router started bootloop and only getting 4-7 ttl100 responses at a time.
After panicking, I managed to find an Ethernet cable and started searching the forum and landed on this http://www.dd-wrt.com/phpBB2/viewtopic.php?t=310880 which clearly states not use this release on broadcom chips
Then found this post and started following the instructions using the following:
1- Raspberry pi (wheezy) + minicom
2- pwr and hdd led cables from an old case
| Quote: | sudo minicom -b 115200 -o -D /dev/ttyAMA0
nvram erase
flash -ctheader : flash1.trx
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I have used tftp.exe to send the firmware.
but then router stopped responding, nothing worked no Lan ports no reset nothing, the serial was showing this http://www.dd-wrt.com/phpBB2/viewtopic.php?p=889405
So I had no choice but to go for the jtag, and my setup was like this
 
PIN(3)--(TDI)---100ohm---PIN(2)
PIN(5)--(TD0)---100ohm---PIN(13)
PIN(7)--(TDI)---100ohm---PIN(4)
PIN(9)--(TDI)---100ohm---PIN(3)
PIN(6)--(GND)------------PIN(20)
downloaded the cfe template and followed instructions from here http://www.dd-wrt.com/phpBB2/viewtopic.php?p=889405:
I used Hirensbootcd to boot into mini win XP and downloaded brjtag v2.0.5
| Quote: | 1. probe
brjtag -probeonly /cable:dlc5 /fc:120 /noreset /nobreak /instrlen:5
2. erase CFE
brjtag -erase:cfe /cable:dlc5 /fc:120 /noreset /nobreak /instrlen:5 /wx8 /verbose
3. erase kernel
brjtag -erase:kernel /cable:dlc5 /fc:120 /noreset /nobreak /instrlen:5 /wx8 /verbose
4. erase NVRAM
brjtag -erase:custom /cable:dlc5 /fc:120 /noreset /nobreak /instrlen:5 /wx8 /verbose /window:1c000000 /start:1cff0000 /length:10000
5. flash CFE
brjtag -flash:cfe /cable:dlc5 /fc:120 /noreset /nobreak /instrlen:5 /wx8 /verbose /noerase
6. backup the CFE
brjtag -backup:cfe /cable:dlc5 /fc:120 /noreset /nobreak /instrlen:5 /wx8 /verbose
7. backup NVRAM
brjtag -backup:custom /cable:dlc5 /fc:120 /noreset /nobreak /instrlen:5 /wx8 /verbose /window:1c000000 /start:1cff0000 /length:10000
8. reboot the e4200 and perform a serial recovery
This time I used windows tftp to send the firmware.
9. You have a revived E4200 v1. |
Finally, I have successfully unbricked my router:) |
Congrats, you're a success story man 
please can you elaborate how you edit Mac address, serial number and Pin ? this may be a noob question but if you make video or complete elaboration for that, help would be highly appreciated
Secondly, i couldn't find pin string mentioned in link you shared, can you please mention pin offset number?
i re-lived my hope to revive my old baby finally  |
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