This is a compressed archive file (RAR format) containing the raw firmware components. To use it, you must:
The device is stuck on the Garmin logo, constantly rebooting, or otherwise unresponsive due to corrupted firmware. Nuvi 26x9 C4 (1948) fw8.80.rar
Before flashing, back up all data from your GPS onto your computer, particularly the /Garmin folder. This is a compressed archive file (RAR format)