Story is that I have several TP-Link WR710N access points in use, flashed with OpenWrt. The preinstalled (factory) OS is a bit too limiting, resource-intensive and cannot be checked for flaws (or be modified for that matter). Whilst reading the OpenWrt website, I saw they merged with the LEDE project and they are merging their efforts. Hooray for this/these amazing project(s).
Since my installations are a bit stale (and they still work like a charm), it was time to do updates. The project has a fine page about sysupgrade, which describes the process for both the GUI (webinterface) and commandline (preferred). As such I'd like to share the experience, together with some examples.