This post will guide you through an OpenWrt Linksys WRT1900ACS installation. It’ll show you how to install OpenWrt on a WRT1900ACS running the stock Linksys firmware.
This summer, the OpenWrt project released OpenWrt 18.06.0. This is the first released since LEDE and OpenWrt merged, and what a nice release it is. The changelog is overflowing with all kinds of changes you want. This guide is based on a WRT1900ACS running version 126.96.36.199405, so your mileage may vary. If you have a router with another version of the Linksys firmware, the user interface might look a little different, but the guide should still provide you with enough information to get OpenWrt installed.
Warning: Flashing third party firmware will void your warranty. I will not be held responsible if anything goes wrong. Flashing a device’s firmware is always a risky operation, especially when you’re dealing with custom, unofficial firmware. By following this amateurish guide you understand that you might end up with a brick – a useless piece of hardware.
Flashing a router with third party firmware isn’t a trivial thing to do, even with the help of this step-by-step guide. Make sure you read through the entire guide at least twice before you start so you get an overview of the steps.