You interrupted the install of the map on your device, thus rendering the map corrupt. Since the map is corrupt the firmware is stuck attempting to load the map. Since the firmware cannot load the map, it bootloops and keeps trying to load the map endlessly.

Not listening to aekhong is what you're doing wrong, since he gave the correct answer. You need to load a version of the firmware customized to ignore the IMG (map) file so that you can regain access to the device and delete the corrupt map. Once you delete the corrupt map and install the standard version of the firmware, you should regain access to the device so you can properly load the map.

Never interrupt the map install...so don't attempt to do the install at work.