This is probably the wrong thread for the topic, but briefly, the developer kit comes with an older version of Ubuntu on it (a.k.a., “L4T”/“Linux for Tegra” once NVIDIA drivers are added). Separately sold modules require flash, but older modules would always have a recommendation to flash with a newer release. Regardless of version, do be sure you have an HDMI monitor since video display does not indicate failure to boot (VGA or some other interface adapters won’t work unless you get lucky).
Serial console is always the best way to know if boot actually worked or failed. See:
JetPack/SDK Manager is a GUI front end for flashing and for adding some extra packages. This runs only on an Ubuntu host. Command line flash can be done from any desktop Linux PC host. Some software availability links are here, including some documentation on getting started (forwarding does not work, so you will probably have to click the link, log in there, and then click the link a second time):
Basically, if you have an Ubuntu PC handy, then the JetPack method is recommended. If you have only a Linux PC without Ubuntu, then you can use that second URL (JetPack downloads and runs the “driver package” and “sample rootfs” for you automatically…which is the second URL…and then flashes or adds packages).
Documentation is available at the various release URLs, but you can always ask more questions. Post a new topic to: