Update Jan 2023: I have written an updated article on doing a sysupgrade from older OpenWrt versions to 19.x. If you want to do an in-place sysupgrade of a 19.x or earlier snapshot, use the instructions from the newer article, but selecting a snapshot image instead of a stable release image. Although stables releases of … OpenWrt: Upgrading OpenWrt to the latest snapshot build
Flashing the firmware of the Linksys WRT1X00AC/S is well documented on the OpenWrt wiki. So I don’t feel the need to go over the architectural concepts in this article, but I did want to provide instructions for the Ubuntu specific tools you can use to flash the firmware. If you want to try flashing to … OpenWrt: Flashing Linksys WRT1X00AC/S from USB-TTL Using Ubuntu
When flashing an OpenWrt image to your newer versioned WRT1900AC/S, be aware that instead of using ‘setenv firmware_name’, you should instead use ‘setenv firmwareName’. The command will not fail, but the router will not understand that it should look for a non-default name for the image and your tftp transfer will fail. This change appears … OpenWrt: Use setenv firmwareName for newer versions of Linksys WRT1900AC/S
Whether you are updating the official LinkSys router firmware or taking it a step further and installing open-source firware like OpenWrt, serial level access to your Linksys router is the most dependable way of guaranteeing a connection. And if you have tried to flash the firmware via the web admin interface and after a reboot … Ubuntu: Serial level access to your Linksys WRT1X00AC/S