TP-Link WR941ND no downgrade possible

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ghost101
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PostPosted: Mon Aug 19, 2019 19:15    Post subject: TP-Link WR941ND no downgrade possible Reply with quote
Hello,

i've dug out my old router and did a big mistake. I updated the Firmware. Ran into some problems with settings and wanted to go down again. Turns out with build 40559 you are not able to downgrade.

I've seen there was such a problem with a previous build and it should been fixed but it's not Crying or Very sad

Can anyone guide me trough the steps of being able to downgrade from my curren build version?

My hardware:

TP-Link WR941N(D) v2.2

current fw: build 40559

desired fw: build 37442

Thanks in advance.
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ghost101
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PostPosted: Thu Aug 22, 2019 12:31    Post subject: Reply with quote
Hm nobody able to help?
Also tried to flash back to OFW which also did not work.
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Malachi
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PostPosted: Thu Aug 22, 2019 22:59    Post subject: Reply with quote
Try method 3 https://wiki.dd-wrt.com/wiki/index.php/Installation#Method_3:_Flashing_with_Command_Line
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ghost101
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PostPosted: Sun Aug 25, 2019 17:21    Post subject: Reply with quote
Thanks for the reply. Tried method 3 but when I try to flash the firmware using the command write {firmware}
linux I get an error message saying:
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Malachi
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PostPosted: Sun Aug 25, 2019 19:19    Post subject: Reply with quote
Which build are you trying to flash? Makes sure the size of the file is smaller than your flash chip size.
It often happens that the builds are too big.
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ghost101
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PostPosted: Sun Aug 25, 2019 19:35    Post subject: Reply with quote
Trying to get r37442 to work as mentioned in my first post.
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Malachi
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PostPosted: Sun Aug 25, 2019 19:47    Post subject: Reply with quote
Like I said, it may be too big.
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ghost101
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PostPosted: Sun Aug 25, 2019 19:55    Post subject: Reply with quote
Latest build r40559, which is on the device right now, is the exact same size. Not sure what I'm doing wrong.
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HasLo
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Joined: 31 Oct 2017
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PostPosted: Sat Nov 30, 2019 10:27    Post subject: Reply with quote
is there any solution?
I am too stuck with firmware 41218, can not upgrade or downgrade.

Tried method-3 also, the problem is same, big file

"Image too big for partition: linux
linux: Invalid argument"

please anyone ?
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HasLo
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PostPosted: Sat Nov 30, 2019 10:37    Post subject: Reply with quote
Forget to mention, my router TP Link WR941ND v3.5

I only know it can not be upgrade or downgrade after I try it today.
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Alozaros
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PostPosted: Sat Nov 30, 2019 12:07    Post subject: Reply with quote
try this command instead...

mtd -f write firmware.bin linux

firmware must be your file name to flash..


as the other members suggested it could be a bit bigger
size...

this unit is no fun, and lot of neglection from BS side on low end routers this days...
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TP-Link WR740Nv1 ---DD-WRT 55630 WAP
TP-Link WR1043NDv2 -DD-WRT 55723 Gateway/DoT,Forced DNS,Ad-Block,Firewall,x4VLAN,VPN
TP-Link WR1043NDv2 -Gargoyle OS 1.15.x AP,DNS,QoS,Quotas
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HasLo
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PostPosted: Sun Dec 01, 2019 1:59    Post subject: Reply with quote
Alozaros wrote:
try this command instead...

mtd -f write firmware.bin linux

firmware must be your file name to flash..


as the other members suggested it could be a bit bigger
size...

this unit is no fun, and lot of neglection from BS side on low end routers this days...


Thanks, Tried as per your instruction, however still can not

[img]https://www.dropbox.com/s/4jz1cev5vchc1g9/Capture.JPG?dl=0[/img]

"""

root@DD-WRT:/tmp# mtd -f write tl.bin linux
\Unlocking linux ...
Could not unlock MTD device: linux
linux: Not supported
Writing from tl.bin to linux ... [ ]Caught SIGSEGV (11) in clearerr_unlocked
Fault at memory location 0x0000004c due to address not mapped to object (1).
Thread 7984: mtd
=== Context:
ZERO:00000000 AT:00000000 V0:00000000 V1:00000000 A0:00000000 A1:00000 000
A2:00000000 A3:00000000 T0:00000000 T1:00000000 T2:00000000 T3:00000 000
T4:00000000 T5:00000000 T6:00000000 T7:00000000 S0:00000000 S1:00000 000
S2:00000000 S3:00000000 S4:00000000 S5:00000000 S6:00000000 S7:00000 000
T8:00000000 T9:00000000 K0:00000000 K1:00000000 GP:00000000 SP:00000 000
FP:00000000 RA:00000000
=== Backtrace:
# [0x773e8fec]: stack size 32
# Text at 0x772dbfff is not mapped; terminating backtrace.
/lib/ld-musl-mips-sf.so.1[0x77384000](clearerr_unlocked+0x00000010)[0x773e8ff0]
/usr/lib/libshutils.so[0x772dc000](safe_fread+0x00000026)[0x772e099f]
=== Code:
773e8fb0: 8f9989c4 afa60030 27a60030 afbf0024 afbc0010 afa70034 afa60018 041114 70
773e8fd0: 00000000 8fbf0024 03e00008 27bd0028 3c1c0005 279c81f0 0399e021 27bdff e0
773e8ff0: >8c82004c afbc0010 afb00018 afbf001c 04400010 00808025 8f998708 0411fd 86
773e9010: 00000000 8fbc0010 8e030000 2404ffcf 00641824 10400009 ae030000 8fbf00 1c

"""
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kernel-panic69
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PostPosted: Sun Dec 01, 2019 3:11    Post subject: Reply with quote
Wonder if this is one that still requires mtd unlock. No idea, not sure of exact command syntax to offer a suggestion. But I thought that it had been changed for a while to write firmware.bin linux and nothing else...
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HasLo
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PostPosted: Sun Dec 01, 2019 5:05    Post subject: Reply with quote
kernel-panic69 wrote:
Wonder if this is one that still requires mtd unlock. No idea, not sure of exact command syntax to offer a suggestion. But I thought that it had been changed for a while to write firmware.bin linux and nothing else...


So, you mean is the END OF THE ROAD ?
I am bit confused with your reply Question Shocked
please do not wonder me, please enlight
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servicetech
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PostPosted: Sun Dec 01, 2019 9:54    Post subject: Reply with quote
HasLo wrote:

So, you mean is the END OF THE ROAD ?
I am bit confused with your reply Question Shocked
please do not wonder me, please enlight


If direct download is not working try to restore a stripped factory image by wired connection (carefully check that you download the correct Version 941nd v2 matching your hardware revision

from

https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=85237
or
https://www.friedzombie.com/tplink-stripped-firmware/

reset all settings on the TP-Link firmware check that the hardware is working with the original firmware
and start again with the factory to dd-wrt with the build you want

Every cross flashing can brick your router, so download everything before that you need for TFTP recovery (all factory and dd-wrt firmware, recovery instructions and TFTP Server program). Use wired connection do not flash over wifi, reset to factory before cross flashing
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