Upgrading OpenWrt firmware using LuCI and CLI
openwrt.org › installation › genericOpenWrt provides sysupgrade utility for firmware upgrade procedure. See CLI instructions page below: Upgrading OpenWrt firmware using CLI For sysupgrade cli based upgrades Download the desired upgrade file to the local /tmp RAM drive on your OpenWrt system. The /tmp directory is stored in RAM (using tmpfs ), not in the permanent flash storage.