More space for packages with extroot on your OpenWrt router
If you would like to install extra packages on OpenWrt, but you have run out of space on your router’s internal flash memory, then this tutorial is for you. The plan is to copy the OpenWrt’s root filesystem onto an external USB flash drive, and tell the router to switch to that when it boots up. All you need is a standard USB flash drive, a USB capable router running OpenWrt, and about 30 mins.