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Re: TP-Link TL-WR841N V9
Posted: Wed Oct 22, 2014 7:44 am
by arampe
Thanks for the reply ,
By serial you means solder on a serial cable to the board then try to tftp in the router...oh lord ! .....i can solder but only if last resort .....
btw , what does the lock/security light mean, can i try to debrick when in that mode ?
Is this usb tftp >>
https://www.youtube.com/watch?v=-ufRivQF4_I
Re: TP-Link TL-WR841N V9
Posted: Wed Oct 22, 2014 8:05 am
by ericwong
arampe wrote:Thanks for the reply ,
By serial you means solder on a serial cable to the board then try to tftp in the router...oh lord ! .....i can solder but only if last resort .....
btw , what does the lock/security light mean, can i try to debrick when in that mode ?
Yup, "solder on a serial cable to the board then try to tftp in the router".
There is no other way unless you are using broadcom based chip which uses CFE recovery, i.e. a web based method to reflash the ROM.
Look up your specific router model and see what is the exact debrick/recovery method. Openwrt.org usually contains all the details.
LED means different things in different routers, I can't tell you what it means. Those debrick/recovery guide might tell you. It probably means uboot (like BIOS in PC) is up and it is going to the next stage but can't. In other words, bricked.
Re: TP-Link TL-WR841N V9
Posted: Wed Oct 22, 2014 8:11 am
by arampe
Re: TP-Link TL-WR841N V9
Posted: Wed Oct 22, 2014 8:45 am
by ericwong
This is the serial tftp recovery I have been talking about.
Re: TP-Link TL-WR841N V9
Posted: Thu Oct 23, 2014 7:32 am
by arampe
ericwong wrote:
This is the serial tftp recovery I have been talking about.
Thank you Eric , can i use any old usb cable , iphone samuse or bb as thise r to hand reach ....or i HAVE to use 3v as openwrt forum suggests ?
Re: TP-Link TL-WR841N V9
Posted: Thu Oct 23, 2014 5:25 pm
by ericwong
arampe wrote:
Thank you Eric , can i use any old usb cable , iphone samuse or bb as thise r to hand reach ....or i HAVE to use 3v as openwrt forum suggests ?
Obviously NOT, do you understand this is SERIAL recovery we have been talking about? Serial as in RS-232, the ancient serial port in all old computers.
http://en.wikipedia.org/wiki/RS-232
USB is NOT serial. What you see in those video is USB to serial adapter they are using. Not a plain USB cable!!
When you get your hands on your serial cable, just do NOT connect the 5V line, and you should be fine. The 5V line is not needed and have the potential to cause damage.
Re: TP-Link TL-WR841N V9
Posted: Sat Dec 06, 2014 5:43 pm
by NeverEnoughHours
medhj wrote:Subject: TP-Link TL-WR841N V9
jjcb wrote:Could you please post a webrevert from DD-WRT to stock ROM for wr841n V9.
Thanks.
this is the file link:
http://q.gs/6git8
and follow this description:
http://wiki.openwrt.org/toh/tp-link/tl-wr841nd
read this:
Go back to original firmware:
With the TL-WR842ND router, there is a catch: the stock firmware is obtained from the OEM:
http://www.tplink.com/en/support/downlo ... =TL-WR841N
in case the file name of this firmware file does not contain the word "boot" in it, you can simply revert back to original firmware
in case the file name of this firmware file does contain the word "boot" in it, you need to cut off parts of the image file before flashing it:
The following method applies both for the V1 V1.5 V3 V5 V7 V8 and V9 since the bootloader is the same size.
An example of an image file with the word "boot" in it is wr841nv9_en_3_14_4_up_boot(131129).bin.
Cut the first 0x20200 (that is 131,584 = 257*512) Bytes from original firmware:
dd if=orig.bin of=tplink.bin skip=257 bs=512
You should transfer the firmeware image to the /tmp folder and revert back to original firmware (if availlable you can flash the firmware via the webinterface as well):
Via the safer method using sysupgrade:
sysupgrade /tmp/tplink.bin
Or you use the mtd method:
mtd -r write tplink.bin firmware
It is also possible to revert to the stock firmware using the method with tftp described in "TFTP install". (you still need the firmware images without the boot part).
OEM TP-Link firmware for the TL-WR841ND with the boot part removed or the original firmware if there wasn't a boot part to revert to the original OEM firmware:
http://www.tplink.com/resources/softwar ... 131129.zip
Thank you so much medhj!!! This saved my $20 router. You put me on the right path since I was lost.
I still don't understand why we/you had to strip off the boot loader? Was it because it was too large of a file? What does a boot loader normally do?
Since I didn't really understand sysupgrade, or where to get it and where to place it, I used the syntax of:
mtd -r write /tmp/tplink.bin linux
After muddling through and eventually getting DD-WRT v24-sp2 (6/23/14) std to finally work, I found I was unable to turn this router into a simple switch. Reverting back to the TP-Link V. 9, it worked as a switch just fine. Maybe I was missing some settings in DD-WRT since I only disabled DHCP and changed its IP address.
BTW, this router came with version 9.1, so now it is reverted to 9.
I can't find anything on TP-Link's site for version 9.1, for the TL-WR481N router. This brings up another question, I have another TL-WR481N router with version 9.1 (and actually, yet another one that has 9.0). Is there a way I can get files off it to update this router?'
This router now reports Hardware Version: WR841N v9 00000000 and Firmware Version: 3.16.9 Build 141013 Rel.61626n.
I don't know what the 9.1 reports since it's still in the shrink wrap.
Re: TP-Link TL-WR841N V9.1
Posted: Sun Dec 07, 2014 8:53 pm
by NeverEnoughHours
Thought I would send some photos of the new Version 9.1 hardware. Note the lack of the obvious inductor (coil) that you find on version 9 :
This one is for locating the R26 resistor:
Links to larger images:
http://www.psz.com/TL-WR841N/overall.jpg
http://www.psz.com/TL-WR841N/RS232.jpg
This one is for locating the R26 resistor:
http://www.psz.com/TL-WR841N/R26.jpg
Re: TP-Link TL-WR841N V9
Posted: Tue Dec 23, 2014 4:58 am
by Valerie
thank you for this link..it works.
Re: TP-Link TL-WR841N V9
Posted: Fri Dec 26, 2014 1:14 pm
by marrco
i had to go back to original tp-link firmware a few days ago from a CC build and this worked fine
http://tech.saoslab.com/post/2014/06/18 ... k-firmware
