Firmware is also software and as far as I can estimate it never got updated after release in the vast majority of cases up until like a decade ago.
Think BIOS/vacuum cleaner/shaver/toothbrush/alarm clock/dumbphone/non-smart TV/airplane kitchen equipment/medical diagnostics devices/PLC's that control most of the entire world's infrastructure and so on.
It's entirely possible and very common to have an actual "final" software release and be just fine (at least up until recently before the whole "everything needs to have internet for telemetry" hype).
Think BIOS/vacuum cleaner/shaver/toothbrush/alarm clock/dumbphone/non-smart TV/airplane kitchen equipment/medical diagnostics devices/PLC's that control most of the entire world's infrastructure and so on.
It's entirely possible and very common to have an actual "final" software release and be just fine (at least up until recently before the whole "everything needs to have internet for telemetry" hype).