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blktDD-WRT Guru Joined: 20 Jan 2019Posts: 6386 |  Posted: Sun Nov 15, 2020 12:52 Post subject: |  | | Use a different Ethernet adapter, cables and/or place a switch in between the computer and router. Use fixed IP, maybe fixed speed setting too. Use an older tp-link binary (confirmed no file modification for v5). Do not crossflash (go back to factory firmware first). | |
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| fcedDD-WRT UserJoined: 04 Apr 2009Posts: 54 | | Posted: Sun Nov 15, 2020 16:36 Post subject: | | | blkt wrote: | | Use a different Ethernet adapter, cables and/or place a switch in between the computer and router. Use fixed IP, maybe fixed speed setting too. Use an older tp-link binary (confirmed no file modification for v5). Do not crossflash (go back to factory firmware first). |
Thank you, i will try all this... What do you mean with : "Use an older tp-link binary (confirmed no file modification for v5)." I tried with two different firmwares from TP-link archer v7 c5 support page, and also with Eu firmwares and US firmwares (just to be sure, my router is EU) ... Do you mean an firmware from v1/v2/v3/? | |
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| fcedDD-WRT UserJoined: 04 Apr 2009Posts: 54 | | Posted: Sun Nov 15, 2020 16:46 Post subject: | | | Alozaros wrote: | | there somewhere around, about TFTP they said, firewall and AV must be off.. in general any TFTP client will do... if you are stuck to DDWRT try updating DDWRT to another build, this will out rule if your flash chip is damaged..i doubt.. In fact Open WRT on this router is overkill...nothing special only it runs 4.x kernel on a single core it means it wont do well.. in OpenWRT things require more understanding and not that easy to configure...there is another way to flash on stuck firmware routers.... https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=311642 but, i dont think this is your issue |
I disabled any antivirus + firewall before I try to flash on both the host computer (Mac) + guest (Virtualbox Windows 7), then i found a very nice and very compatible tftp macintosh software (PumPkin), i tried with it too.. I don't know if there is another DDWRT firmware (another release for Archer C7 v5), but I tried also with factory-to-ddwrt.bin (which is the first DDWRT firmware i flashed) but after i flashed it, my router DDWRT infos were still the same. If I understand correctly, you don't recommend me to try OpenWRT... It will slow the router... Edit : Archer C7 v5 don't have two CPUS, only one) http://en.techinfodepot.shoutwiki.com/wiki/TP-LINK_Archer_C7_v5.x I come from Tomato firmwares i was on tomato during 15 years, and i miss some functionalities. TBH If I could find how to see the bandwidth in real time for each Device i have on my Lan (Each lan connected IP), i would stop to try flash something else.. | |
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| blktDD-WRT GuruJoined: 20 Jan 2019Posts: 6386 | | Posted: Sun Nov 15, 2020 17:19 Post subject: | | | fced wrote: | | What do you mean with : "Use an older tp-link binary (confirmed no file modification for v5)." |
It means I've double confirmed there is no header to strip out for v5, because I searched forum threads. | fced wrote: | | I tried with two different firmwares from TP-link archer v7 c5 support page |
Which ones exactly? | fced wrote: | | and also with Eu firmwares and US firmwares (just to be sure, my router is EU) |
This would have been useful information a long time ago; use only the region of your router hardware. | fced wrote: | | Do you mean an firmware from v1/v2/v3/? |
No/No/No. | Code: | | https://static.tp-link.com/2017/201712/20171229/Archer%20C7(EU)_V5_170918.zip |
Published Date: 2017-12-29 1. The first firmware released. | Code: | | https://static.tp-link.com/2018/201803/20180327/Archer%20C7(EU)_V5_180308.zip |
Published Date: 2018-03-27 1. Added ALEXA & IFTTT function. 2. Support web management through HTTPS. 3. Improve the performance and stability. | Code: | | https://static.tp-link.com/2018/201805/20180518/Archer%20C7(EU)_V5_180425.zip |
Published Date: 2018-05-18 1. Improved the reliability for wireless connection on 5GHz. | |
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| fcedDD-WRT UserJoined: 04 Apr 2009Posts: 54 | | Posted: Sun Nov 15, 2020 18:52 Post subject: | | | blkt wrote: | | Which ones exactly? |
I tried with the 3 firmwares from EU: Archer C7(EU)_V5 200628.bin Archer C7(EU)_V5_190726.bin Archer C7(EU)_V5_201030.bin and two from US : Archer C7(US)_V5_190726.bin Archer C7(US)_V5 200628.bin I was also sure i tried with a revert firmware i found on the forum ArcherC7v2_tp_recovery.bin, but it was probably a firmware for the A2, and hopefully it didn't worked.. Edit : ATM, i am trying with another ethernet cable, it didn't worked - Someone in a precedent suggested i should try to flash with another DDWRT firmware, could i use this one : factory-to-ddwrt.bin (it is the only one i know), and could it brick the router if i flash it with tftp ? Edit 2: This is really weird, DDWRT permit me to upgrade DDWRT Firmwares only, i had no trouble upgrading to the latest release (from webif -> upgrade): ftp://ftp.dd-wrt.com/betas/2020/11-03-2020-r44715/tplink_archer-c7-v5/ Could it be something from DDWRT which prevent the upgrade to anything else than DDWRT ? | |
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| fcedDD-WRT UserJoined: 04 Apr 2009Posts: 54 | | Posted: Sun Nov 15, 2020 21:41 Post subject: | | | I would like to understand : header to strip out for v5. What does this mean exactly, and how to "strip" (remove?) the header from a firmware to allow DDWRT to accept the flash - and of course, what is the header (i know the header of a html file, is this the same sort of thing) ? I could do it by myself if only i knew what i must do to the file, and which what tool i should edit it (an hex editor?) ... On a video, i saw someone doing this (i think it was this) with mtd utils on the router. He was uploading the firmware to /temp folder on the router, then he was modifying it with mtd... I could to the same, but i prefer understanding what i am doing to avoid bricking the router, i have enough trouble with it atm... | |
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| fcedDD-WRT UserJoined: 04 Apr 2009Posts: 54 | | Posted: Mon Nov 16, 2020 1:13 Post subject: | | Great my Archer c7 v5 is completely bricked. Following the guide here : https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=311642 I uploaded the oldest TP-Link to /tmp folder with ssh (renamed it ArcherC7v5_tp_recovery.bin) then i typed : | Code: | | 5 mtd -f write boot.bin fullflash 6. reboot |
The router rebooted without asking, and now it is completely bricked, it don't respond even to ping, not even on 192.168.0.86 IP, and i can't even set it to recovery mode (Press reset while powering it during 5 sec), the Archer C7 v5 have two led enabled, while i was monitoring with Wireshark (any device removed, any network disabled except eth1) i notified this IP 169.254.255.255, i pinged it and it answered to my ping, but can't connect with ssh to it (refused or permission denied), ftp don't work too, is there something to do with?...  If someone have an idea to revive it, i would appreciate. DDWRT Devs should be sure we can return to any other firmware, or at least factory firmware before releasing a firmware to public. | |
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| fcedDD-WRT UserJoined: 04 Apr 2009Posts: 54 | | Posted: Mon Nov 16, 2020 21:51 Post subject: | | | Why can't we revert to factory with web upgrade or tftp once the Archer C7 V5 had DDWRT on it ? The web if full of request for stripped TP Link firmwares, and i have found many Archer C7 users (from v2 to v5 ) trying to search help to revert firmware for whatever reason (usually to switch on OpenWRT) Are All routers stuck on DDWRT once it is installed ? or it it a specificity of the Archer C7 design ? Is it the same once installed OpenWRT from factory firmware ? no return possible ? Please I would really appreciate an explanation... | |
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kernel-panic69DD-WRT Guru Joined: 08 May 2018Posts: 16708Location: Texas, USA | | Posted: Tue Nov 17, 2020 0:42 Post subject: | | | I'm curious as to why you were following that guide, anyway? Was the C7v5 even supported during that time? P.S. that guide is for upgrading DD-WRT, not flashing stock firmware. I'm thoroughly confused by what you are doing._________________"Life is but a fleeting moment, a vapor that vanishes quickly; All is vanity" Contribute To DD-WRT Pogo - A minimal level of ability is expected and needed... RSS feed for DD-WRT releases (2025) RSS feed for DD-WRT releases (2024) RSS feed for DD-WRT releases (2023) ---------------------- Linux User #377467 counter.li.org / linuxcounter.net | |
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| blktDD-WRT GuruJoined: 20 Jan 2019Posts: 6386 | | Posted: Tue Nov 17, 2020 4:14 Post subject: | | | fced wrote: | | Why can't we revert to factory with web upgrade or tftp once the Archer C7 V5 had DDWRT on it ? |
It's because you failed to read, understand and follow instructions. | fced wrote: | | The web if full of request for stripped TP Link firmwares, and i have found many Archer C7 users (from v2 to v5 ) trying to search help to revert firmware for whatever reason (usually to switch on OpenWRT) |
"Stripped" V5 firmwares do not exist; there was never a need to modify files. You do not have V2; its files are not relevant. | fced wrote: | | Are All routers stuck on DDWRT once it is installed ? or it it a specificity of the Archer C7 design ? |
No and No. It's only because of failure to read and follow instructions for TFTP recovery with oldest TP-Link C7v5 files. | fced wrote: | | Is it the same once installed OpenWRT from factory firmware ? no return possible ? |
There was never any problem, and in both cases use TFTP recovery back to stock firmware. | fced wrote: | | Please I would really appreciate an explanation... |
You can now do your own research, if anything TTL serial recovery. | |
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| fcedDD-WRT UserJoined: 04 Apr 2009Posts: 54 | | Posted: Tue Nov 17, 2020 16:33 Post subject: | | | kernel-panic69 wrote: | | I'm curious as to why you were following that guide, anyway? Was the C7v5 even supported during that time? P.S. that guide is for upgrading DD-WRT, not flashing stock firmware. I'm thoroughly confused by what you are doing. |
At first I didn't make the difference between v5 and v2, i was following a tutorial thinking router were the same, and i was thinking also a "a firmware is a firmware" what is working for one should work for the other. I even made the mistake following a guide to revert which was for the Archer A7  If only someone had said reverting is not possible atm for the Archer C7 v5, I would have stopped to try, but from what i read (from the answer) i understood reverting to factory for the Archer c7 v5 was possible, but i was doing something wrong, so i continued to try (cables, different tftp softwares), then again i made the mistake to follow a video which was for the v2 (thinking it was for the v5) https://www.youtube.com/watch?v=RKPZPSU0axk Firstly, when i was following the video "guide" i entered | Code: | | mtd -r write ArcherC7v5_tp_recovery.bin linux - |
Nothing bad happened, the router answered by hesitating between "e/w" switching from e to w during one or two minutes, then returned a compatibility or error msg... No harm done. I supposed the problem came from mtd cmd value and when i found the other guide on ddwrt forum i thought nothing bad will happen, router will return an error message at worst... this led me to enter the mtd command which killed my router : | Code: | | mtd -r write ArcherC7v5_tp_recovery.bin fullflash |
#################################### To end this : I have read a lot of things, tried a lot of things, but all this led me to one conclusion. Once installed DDWRT on a Archer C7 V5 reverting to factory firmware is not possible, because Stripped firmware don't exist yet, stripped firmware exist for other revisions v2 for example, but not for the v5. Don't waste your time trying to revert. If you are not sure which firmware you want to keep (OpenWRT or DDWRT) read doc, view screenshots, and don't think you could try DDWRT then switch on OpenWRT (or the reverse). It is not possible.Last edited by fced on Tue Nov 17, 2020 19:07; edited 3 times in total | |
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| fcedDD-WRT UserJoined: 04 Apr 2009Posts: 54 | | Posted: Tue Nov 17, 2020 16:37 Post subject: | | | blkt wrote: | | No and No. It's only because of failure to read and follow instructions for TFTP recovery with oldest TP-Link C7v5 files. |
You should try by yourself, read my posts (the one i sent sooner), i tried with two TFTP versions on PC (oldest 32bits, and latest 64 bits - got ack error - cf log). TFTP LOG Code: Connection received from 192.168.0.86 on port 2148 [14/11 10:38:09.113] Read request for file <ArcherC7v5_tp_recovery.bin>. Mode octet [14/11 10:38:09.113] OACK: <timeout=5,blksize=1468,> [14/11 10:38:09.113] Using local port 63161 [14/11 10:38:09.113] TIMEOUT waiting for Ack block #7014 [14/11 10:38:43.801] Pumpkin on Mac worked perfectly, each time i saw the file sent from the tftp server but when the router restarted (by itself), DDWRT was still installed. Ps : I was using fixed IP to 192.168.0.66/255.255.255.0, tried several Ethernet cables (all different i have plenty). I could understand the point to do this if there was not connection between TFTP and the router but it was not the case, Pumpkin/TFTP PC and the router were perfectly communicating the firmware was sent each time. Tried also with all the TP_link firmwares EU (and some US). | |
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| fcedDD-WRT UserJoined: 04 Apr 2009Posts: 54 | | Posted: Tue Nov 17, 2020 18:40 Post subject: | | I found a tutorial to strip a firmware (on the case it is a factory for the V2) https://www.refirmlabs.com/reverse-engineering-my-routers-firmware-with-binwalk/ I thought it was for the C7 v5 because the values in binwalk output were the same than mine, but apparently the firmware in the case would be the Archer C7 v2.bin. Would it be possible to get the good values (bs / skip / count) to strip an Archer C7 v5 firmware following refirmlabs tutorial ? How peoples which are stripping firmwares for v2 are doing to get the good values for : | Code: | | dd if=archer-c7.bin of=uImage bs=1 skip=78448 count=1088572 |
| Code: | | dd if=uImage of=Image.lzma bs=1 skip=72 |
and for | Code: | | mtd -r write ArcherC7v5_tp_recovery.bin fullflash |
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|2e4perDD-WRT Novice Joined: 12 Jun 2007Posts: 32Location: Aachen, Germany | | Posted: Thu Dec 23, 2021 10:25 Post subject: | | | Hey there, I just tried the conversation. So yesterday I received flame new ArcherC7v5(EU) Routers and I picked one and upgraded DD-WRT current Version (r47900) on it. Afterwards I tried to simplified go back to stock firmware via the DD-WRT WebUI Firmware Upgrade and that didn't work. This is why i found this thread but I could hardly believe that the conclusion mentioned here to be "jailed" to DD-WRT is correct because back in the days I already reverted some units and although I managed to convert the wrt 320n to an e2000 and this is still running... In the end, I only needed those three resources to successfully revert to stock TP Link Firmware from DD-WRT. current firmware and rename it to Archerc7v5_tp_recovery.bin https://www.tp-link.com/de/support/download/archer-c7/#Firmware General overview about things to have done (already pointed to in this thread) https://www.youtube.com/watch?v=1uiyY0qCFBQ and this to use the tftp server on my machine. https://www.wirelessphreak.com/2016/07/using-built-in-tftp-server-on-os-x-el.html I used of course wired connection to the router. And it worked on the 2nd try._________________|2e4per all running site-to-site OpenVPN 4x WRT54GL v1.1 @ 14929 1x WRT320N chang'd to E2000 bricked -> debricked @ v3.0-r29519 mega 1x Archer C7 v2.0 @ v3.0-r29519 std 1x Archer C7 v4.0 @ v3.0-r35874 std 1x ASUS RT-AC68U H/W ver.E1 @ v3.0-r36070M kongac 2x Netgear R7000P @ v3.0-r36070M kongac | |
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