TP-LINK TL-WR841N(D) v8 Revert Help

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tukra
DD-WRT Novice


Joined: 03 Nov 2013
Posts: 3

PostPosted: Sun Nov 03, 2013 23:10    Post subject: TP-LINK TL-WR841N(D) v8 Revert Help Reply with quote
I'm trying to revert my TL-WR841N v8 back to factory. There is no webrevert I can find but I found instructions on how to do it via ssh at:
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=171026&highlight=wr841n

When I run mtd unfortunately I get:
Erasing mtd failed: linux

I'm afraid if my router reboots now it will brick. Please help!

UPDATE: Bricked. I assume this needs JTAG reprogramming now?

Of course there really is a webrevert, I just didn't look far enough into the thread:
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=85237&postdays=0&postorder=asc&start=30

Turns out the firmware from tp-link includes a boot loader that must be removed before using mtd (true for all images with "boot" in the name). Too bad I did that operation on the device and filled up the RAM. BRICK!

Anyone else using the instructions I linked above beware. You need to clip off the front of tp-link "boot" images to get the size to 3,932,160. If your bin is already this size then don't do this.

I found instructions here (!!!BEWARE!!!):
http://wiki.openwrt.org/toh/tp-link/tl-wr741nd#back.to.original.firmware
Don't follow them exactly though because they have you do the truncation on the device which will fill the memory and freeze your router.

Instead, if you have unix tools on your PC you can do:
dd if=orig.bin of=tplink.bin skip=257 bs=512
Where 'orig.bin' is the tp-link "boot" image and 'tplink.bin' is what you will copy to the router for mtd'ing.
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nebbia88
DD-WRT User


Joined: 08 Mar 2010
Posts: 174

PostPosted: Mon Nov 04, 2013 20:44    Post subject: Reply with quote
you will need a TTL (3.3V) Serial interface, not JTAG!

anyway usually with "fresh" setup and 32 MB RAM you have at least 10 MB RAM free, so enough to store 2 firmware files (on routers with 4MB flash..)
obviously if you try that more than one time without removing other fw images from /tmp you fill it..
rizel
DD-WRT User


Joined: 08 Oct 2012
Posts: 56

PostPosted: Mon Nov 04, 2013 22:37    Post subject: Re: TP-LINK TL-WR841N(D) v8 Revert Help Reply with quote
tukra wrote:
I'm trying to revert my TL-WR841N v8 back to factory. There is no webrevert I can find but I found instructions on how to do it via ssh at:
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=171026&highlight=wr841n

When I run mtd unfortunately I get:
Erasing mtd failed: linux

I'm afraid if my router reboots now it will brick. Please help!

UPDATE: Bricked. I assume this needs JTAG reprogramming now?

Of course there really is a webrevert, I just didn't look far enough into the thread:
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=85237&postdays=0&postorder=asc&start=30

Turns out the firmware from tp-link includes a boot loader that must be removed before using mtd (true for all images with "boot" in the name). Too bad I did that operation on the device and filled up the RAM. BRICK!

Anyone else using the instructions I linked above beware. You need to clip off the front of tp-link "boot" images to get the size to 3,932,160. If your bin is already this size then don't do this.

I found instructions here (!!!BEWARE!!!):
http://wiki.openwrt.org/toh/tp-link/tl-wr741nd#back.to.original.firmware
Don't follow them exactly though because they have you do the truncation on the device which will fill the memory and freeze your router.

Instead, if you have unix tools on your PC you can do:
dd if=orig.bin of=tplink.bin skip=257 bs=512
Where 'orig.bin' is the tp-link "boot" image and 'tplink.bin' is what you will copy to the router for mtd'ing.

on your ddwrt interface you must flash this build tp-link 841n v.8 it was very simple....i test this one and it works,i return to original firmware in 5 min.
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=85237&postdays=0&postorder=asc&start=30
tukra
DD-WRT Novice


Joined: 03 Nov 2013
Posts: 3

PostPosted: Tue Nov 05, 2013 23:52    Post subject: Reply with quote
nebbia88 wrote:
10 MB RAM free, so enough to store 2 firmware files (on routers with 4MB flash..)


I know what you mean but as soon as I made the second image with dd I could no longer run any commands in the shell I had open. 'ls' would respond 'Invalid command'. The web interface was still responsive but new ssh sessions would also die after login when trying to start the shell.

Oh well. Easier to send it back as defective than build a serial cable.
Saltapistas
DD-WRT Novice


Joined: 06 Mar 2014
Posts: 1

PostPosted: Thu Mar 06, 2014 16:42    Post subject: .... Reply with quote
....
mebalna
DD-WRT Novice


Joined: 04 Aug 2014
Posts: 1

PostPosted: Mon Aug 04, 2014 11:41    Post subject: Re: TP-LINK TL-WR841N(D) v8 Revert Help Reply with quote
rizel wrote:
tukra wrote:
I'm trying to revert my TL-WR841N v8 back to factory. There is no webrevert I can find but I found instructions on how to do it via ssh at:
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=171026&highlight=wr841n

When I run mtd unfortunately I get:
Erasing mtd failed: linux

I'm afraid if my router reboots now it will brick. Please help!

UPDATE: Bricked. I assume this needs JTAG reprogramming now?

Of course there really is a webrevert, I just didn't look far enough into the thread:
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=85237&postdays=0&postorder=asc&start=30

Turns out the firmware from tp-link includes a boot loader that must be removed before using mtd (true for all images with "boot" in the name). Too bad I did that operation on the device and filled up the RAM. BRICK!

Anyone else using the instructions I linked above beware. You need to clip off the front of tp-link "boot" images to get the size to 3,932,160. If your bin is already this size then don't do this.

I found instructions here (!!!BEWARE!!!):
http://wiki.openwrt.org/toh/tp-link/tl-wr741nd#back.to.original.firmware
Don't follow them exactly though because they have you do the truncation on the device which will fill the memory and freeze your router.

Instead, if you have unix tools on your PC you can do:
dd if=orig.bin of=tplink.bin skip=257 bs=512
Where 'orig.bin' is the tp-link "boot" image and 'tplink.bin' is what you will copy to the router for mtd'ing.

on your ddwrt interface you must flash this build tp-link 841n v.8 it was very simple....i test this one and it works,i return to original firmware in 5 min.
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=85237&postdays=0&postorder=asc&start=30


I constantly get "Upgrade failed" msg. Any idea why? v8 , thx
Megaherox
DD-WRT Novice


Joined: 11 Dec 2013
Posts: 1

PostPosted: Sat Aug 16, 2014 8:53    Post subject: Re: TP-LINK TL-WR841N(D) v8 Revert Help Reply with quote
mebalna wrote:
rizel wrote:
tukra wrote:
I'm trying to revert my TL-WR841N v8 back to factory. There is no webrevert I can find but I found instructions on how to do it via ssh at:
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=171026&highlight=wr841n

When I run mtd unfortunately I get:
Erasing mtd failed: linux

I'm afraid if my router reboots now it will brick. Please help!

UPDATE: Bricked. I assume this needs JTAG reprogramming now?

Of course there really is a webrevert, I just didn't look far enough into the thread:
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=85237&postdays=0&postorder=asc&start=30

Turns out the firmware from tp-link includes a boot loader that must be removed before using mtd (true for all images with "boot" in the name). Too bad I did that operation on the device and filled up the RAM. BRICK!

Anyone else using the instructions I linked above beware. You need to clip off the front of tp-link "boot" images to get the size to 3,932,160. If your bin is already this size then don't do this.

I found instructions here (!!!BEWARE!!!):
http://wiki.openwrt.org/toh/tp-link/tl-wr741nd#back.to.original.firmware
Don't follow them exactly though because they have you do the truncation on the device which will fill the memory and freeze your router.

Instead, if you have unix tools on your PC you can do:
dd if=orig.bin of=tplink.bin skip=257 bs=512
Where 'orig.bin' is the tp-link "boot" image and 'tplink.bin' is what you will copy to the router for mtd'ing.

on your ddwrt interface you must flash this build tp-link 841n v.8 it was very simple....i test this one and it works,i return to original firmware in 5 min.
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=85237&postdays=0&postorder=asc&start=30


I constantly get "Upgrade failed" msg. Any idea why? v8 , thx



Try a older dd-wrt version from 2013 or 2012 i have the same Problem
MIchaell56
DD-WRT Novice


Joined: 29 May 2015
Posts: 2

PostPosted: Fri May 29, 2015 13:01    Post subject: Re: TP-LINK TL-WR841N(D) v8 Revert Help Reply with quote
I'm trying to revert my TL-WR841N v8 back to factory. Pls help!
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