Though the whole flashing process can be done via web interface without getting your hands dirty, there are cases that the web upgraded is not practical or possible. One common scenario is a semi-bricked router (no web access and no ping response due to bad flash or invalid operation, or you just want to try other firmware like OpenWrt). Luckily that the WZR-HP-G300NH has a robust bootloader and the router can be recovered by using TFTP, either in Windows, Linux or OSX. Flashing via TFTP isn't pretty, so read the appropriate section carefully at least once before attempting.
