# Archer C6 V2 (EU) bricked/bootloop **URL:** \ **Category:** Installing and Using OpenWrt\ **Created:** [August 15, 2020, 1:51pm UTC](https://forum.openwrt.org/t/archer-c6-v2-eu-bricked-bootloop/71803 "2020-08-15T13:51:51Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![noseran](https://forum.openwrt.org/letter_avatar/noseran/32/5_5575768a8748004e209b776fc1b2916d.png) [@noseran](https://forum.openwrt.org/u/noseran)\ **Post date:** [August 15, 2020, 1:51pm UTC](https://forum.openwrt.org/t/archer-c6-v2-eu-bricked-bootloop/71803/1 "2020-08-15T13:51:51Z")
Hi, i've been trying to go back to the original firmware on my Archer C6 V2 (EU) but today i screwed up. I flashed the sysupgrade bin instead of the factory bin and now i can't even go back to openwrt. I have serial access to the router and when i try to upload the original firmware through tftpd i get the following output: ``` TFTP from server 192.168.0.66; our IP address is 192.168.0.86 Filename 'ArcherC6v2_tp_recovery.bin'. Load address: 0x80060000 Loading: ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# #################################################### done Bytes transferred = 7919281 (78d6b1 hex) Firmware downloaded... filesize = 0x78d6b1 fileaddr = 0x80060000. Firmware Recovery file length : 7919281 Firmware process id 2. handle_fw_cloud 146 [NM_Error](handle_fw_cloud) 00164: Check rsa error. recovery failed. now restart... ``` ---
**Author:** ![123serge123](https://forum.openwrt.org/letter_avatar/123serge123/32/5_5575768a8748004e209b776fc1b2916d.png) [@123serge123](https://forum.openwrt.org/u/123serge123)\ **Post date:** [August 15, 2020, 5:34pm UTC](https://forum.openwrt.org/t/archer-c6-v2-eu-bricked-bootloop/71803/2 "2020-08-15T17:34:32Z")
Did you read this topic? > [@Can't boot tftp recovery Archer C6 v2](https://forum.openwrt.org/t/cant-boot-tftp-recovery-archer-c6-v2/36487): > > Hi everyone, First, I'm sorry for my bad english (i'm french) Here's my problem : i just bought the Archer C6 Tp Link router (V2). I want Open WRT on it for experience and DHCP connection (my ISP is Orange Telecom) I follow this link : [https://openwrt.org/toh/hwdata/tp-link/tp-link\_archer\_c6\_v2\_eu](https://openwrt.org/toh/hwdata/tp-link/tp-link_archer_c6_v2_eu) I download the openwrt factory firmware et sysupgrade firmware : both of them don't work with web gui. I have error message : "Invalid file type" So I decide to go with tftp recovery with tftpd64… ---
**Author:** ![noseran](https://forum.openwrt.org/letter_avatar/noseran/32/5_5575768a8748004e209b776fc1b2916d.png) [@noseran](https://forum.openwrt.org/u/noseran)\ **Post date:** [August 15, 2020, 6:22pm UTC](https://forum.openwrt.org/t/archer-c6-v2-eu-bricked-bootloop/71803/3 "2020-08-15T18:22:44Z")
@123serge123 Yes, i've read that topic before. My problem is not using tftpd, i can upload openwrt successfully... The problem is that the router rejects the original firmware and now i can't even boot openwrt (bootloop). My main goal is going back to the original firmware, but if i can't, i wouldn't mind having it running openwrt again... ---
**Author:** ![noseran](https://forum.openwrt.org/letter_avatar/noseran/32/5_5575768a8748004e209b776fc1b2916d.png) [@noseran](https://forum.openwrt.org/u/noseran)\ **Post date:** [August 15, 2020, 6:24pm UTC](https://forum.openwrt.org/t/archer-c6-v2-eu-bricked-bootloop/71803/4 "2020-08-15T18:24:31Z")
I can provide command outputs if needded ---
**Author:** ![123serge123](https://forum.openwrt.org/letter_avatar/123serge123/32/5_5575768a8748004e209b776fc1b2916d.png) [@123serge123](https://forum.openwrt.org/u/123serge123)\ **Post date:** [August 15, 2020, 6:54pm UTC](https://forum.openwrt.org/t/archer-c6-v2-eu-bricked-bootloop/71803/5 "2020-08-15T18:54:21Z")
1. It's possible that you use wrong vendor firmware, isn't it? Try older/newer version. 2. You can try prepare new image from vendor firmware for flashing from openwrt command line. Vendor firmware file contain all information for this procedure. Flash layout: ``` partition fs-uboot base 0x00000 size 0x20000 partition default-mac base 0x20000 size 0x00200 partition pin base 0x20200 size 0x00100 partition product-info base 0x20300 size 0x00200 partition device-id base 0x20500 size 0x0fb00 partition os-image base 0x30000 size 0x100000 partition file-system base 0x130000 size 0x6a9400 partition soft-version base 0x7d9400 size 0x00100 partition extra-para base 0x7d9500 size 0x00100 partition support-list base 0x7d9600 size 0x00200 partition profile base 0x7d9800 size 0x03000 partition default-config base 0x7dc800 size 0x03000 partition partition-table base 0x7df800 size 0x00800 partition user-config base 0x7e0000 size 0x0c000 partition certificate base 0x7ec000 size 0x04000 partition radio base 0x7f0000 size 0x10000 ``` And vendor firmware layout: ``` fwup-ptn product-info base 0x01000 size 0x00115 fwup-ptn os-image base 0x01115 size 0xffdb8 fwup-ptn file-system base 0x100ecd size 0x69363f fwup-ptn soft-version base 0x79450c size 0x00059 fwup-ptn extra-para base 0x794565 size 0x0000b fwup-ptn support-list base 0x794570 size 0x00055 fwup-ptn profile base 0x7945c5 size 0x02e1d fwup-ptn default-config base 0x7973e2 size 0x02a34 fwup-ptn partition-table base 0x00800 size 0x00800 ``` So you can split vendor firmware file to get kernel (os-image) and rootfs (file-system) files. Then pad kernel file upto os-image partition size (partition **os-image** base 0x30000 **size 0x100000** ) and append rootfs. This new firmware file may be flashed from openwrt command line with sysupgrade or mtd command. P.S. To split vendor firmware file you can use tplink-safeloader utility from current openwrt trunk. P.P.S. For example I use file ArcherC6v2\_ru-up-ver1-3-0-P1[20200508-rel63078].bin ---
**Author:** ![noseran](https://forum.openwrt.org/letter_avatar/noseran/32/5_5575768a8748004e209b776fc1b2916d.png) [@noseran](https://forum.openwrt.org/u/noseran)\ **Post date:** [August 15, 2020, 9:35pm UTC](https://forum.openwrt.org/t/archer-c6-v2-eu-bricked-bootloop/71803/6 "2020-08-15T21:35:28Z")
I've managed to boot openwrt with an alternative version i had with a tp-link style theme and after that i could boot the newer version. (i don't know what did it but it worked) > It's possible that you use wrong vendor firmware, isn't it? Try older/newer version. Regarding firmware i always double check the versions i download so i don't have the wrong ones laying around. > You can try prepare new image from vendor firmware for flashing from openwrt command line. (...) I've never messed with stuff specifically like this but i'll give it a try in the next days, i'll keep you posted. ---
**Author:** ![noseran](https://forum.openwrt.org/letter_avatar/noseran/32/5_5575768a8748004e209b776fc1b2916d.png) [@noseran](https://forum.openwrt.org/u/noseran)\ **Post date:** [August 16, 2020, 6:10am UTC](https://forum.openwrt.org/t/archer-c6-v2-eu-bricked-bootloop/71803/7 "2020-08-16T06:10:52Z")
@123serge123 Thanks a lot man! I tought i would be a lot slower following your instructions but i made it! Here is what i did: 1. got [**tplink-safeloader.c**](https://github.com/lede-project/source/blob/master/tools/firmware-utils/src/tplink-safeloader.c), [**md5.c**](https://github.com/lede-project/source/blob/master/tools/firmware-utils/src/md5.c) and [**md5.h**](https://github.com/lede-project/source/blob/master/tools/firmware-utils/src/md5.h) from the [lede-project github page](https://github.com/lede-project) 2. compiled md5 and the tplink-safeloader: ``` gcc -c md5.c gcc tplink-safeloader.c md5.c -o tplink-safeloader ``` 1. got an older version of the original firmware (so i could update it after, using the webpage) and ran the tool: (got the arguments and board model (ARCHER-C6-V2) digging through the tplink-safeloader.c code) ``` mkdir firmware ./tplink-safeloader -B "ARCHER-C6-V2" -x ArcherC6v2_eu-up-ver1-1-0-P1[20190115-rel71848].bin -d firmware/ ``` 1. added pad to the kernel file (the partition is **0x100000** , so hex to dec, **1048576** bytes minus the size of kernel (`wc -c < os-image`) = #your own value# (so people don't lead into error)) ``` cd firmware dd if=/dev/zero bs=1 count=#your own value# >> os-image ``` 1. appended the two files: ``` dd if=os-image >> original_sysupdate.bin dd if=file-system >> original_sysupdate.bin ``` 1. using the openwrt web interface i flashed the new original\_sysupdate.bin image with the option to force the update (risking bricking it if i didn't know how to recover) 2. now on tplinks web interface i updated to the latest firmware and voila, running oem again! P.S.: Thanks a lot for the help @123serge123. And if i mistyped something please say so. ---
**Author:** ![system](https://forum.openwrt.org/uploads/default/original/3X/7/4/740520c71f00039bbf001045c682f0ecb25e905a.png) [@system](https://forum.openwrt.org/u/system)\ **Post date:** [August 26, 2020, 6:10am UTC](https://forum.openwrt.org/t/archer-c6-v2-eu-bricked-bootloop/71803/8 "2020-08-26T06:10:53Z")
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