Upgrading the TP-Link Archer C5 (v1.2) to an Archer C7 (v2.0)

I own a TP-Link Archer C5 router, version 1.2 – which is identical to the TP-Link Archer C7, version 2.0, save for some limitations which are introduced through software. These limitations include a 300Mbps cap on 2.4GHz (450Mbps for the C7) and a 876Mbps cap on 5GHz (1300Mbps on the C7). Not that much, but still enough to be worth tinkering for.
Since I was looking at increasing the WiFi speeds in my home, I searched around a bit, and found out on Stefan Thesen’s blog and Hagensieker’s blog that it is perfectly possible :)

First, make sure you definitely have an Archer C5 version 1.2, with three antennas. Don’t even try with another version. If it breaks, noone is to blame but you.

You’ll need to flash DD-WRT, OpenWRT or LEDE-Project (check the respective projects for instructions on how to do that) first.

Next, download an Archer C7 firmware from the TP-Link website. I downloaded version 3.14.1 (141110) – which contains the firmware in the file ArcherC7v2_v3_en_3_14_1_up_boot(141110).bin

Now, remove the first 256 bytes, which is the bootloader (which we don’t need to flash it):  dd if=ArcherC7v2_v3_en_3_14_1_up_boot(141110).bin of=tplink_mod.bin skip=257 bs=512 (In case you don’t trust doing it yourself, you can also download the firmware from the blog of Stefan)

Next, you can transmit this (using SFTP) to your router, and then force flash it: sysupgrade -F /tmp/tplink_mod.bin. This will flash the firmware, and reboot the router. You’ll have to reconnect to it (default IP address is 192.168.0.1) and the web interface should report an Archer C7 :)

Afterwards you can either upgrade to the latest C7 firmware, or whichever 3rd party firmware you want. I reflashed to LEDE-Project.

Initial testing showed an improvement in WiFi throughput speeds – so I’m happy with my ‘new’ C7 :)

OpenWRT, dual routers, dual SSIDs and VLANS

Back in the day I used to have one router in the house: the D-Link DIR-825, flashed with OpenWRT. Configured with two SSIDs – one for internal network use, and one for guest access – the latter being separate from the internal network of the flat.

After moving to our house, I discovered that the house construction materials provide a better shielding for radio signals, which in turn meant that the reach of my WiFi router wasn’t quite what it should be to reach the far corners of the place. I tried increasing the output wattage, but that had only a marginal increase in reach. So in the end I opted getting a new primary router – the TP-Link Archer C5 (though mine has three antennas?), which was promptly reflashed with OpenWRT. The DIR-825 was moved to the opposite corner of the house to increase reach, and at the same time I lowered the output wattage of the radios.
Because of time constraints, I didn’t bother stretching the guest wifi to the second router, as it requires a bit more configuration to properly separate the flows of data between the two networks: vlan configuration.

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