Sometimes, the "firmware" you need is actually a safety recall. Enter your VIN on the Nissan recall portal. If a TSB (Technical Service Bulletin) covers your issue, the dealer must update the firmware for free.
If available, follow the on-screen prompts to download and install. Nissan Map Update Tool nissan firmware download
While Nissan generally does not charge for the OTA software itself, dealerships may charge labor fees if they perform the update for you. Sometimes, the "firmware" you need is actually a