According to Amazon, as of Oct 20, the latest firmware for the Echo, Echo Dot (gen1) and Echo Dot (gen2) is version 4148.
My Echo is still on version 4008.
To force an update, press the Mute button on the top of your Echo so that the ring glows red. After leaving it like this for at least 30 minutes, the firmware should automatically update. It might be best to leave it like this for an hour or two.
So what's new in version 4148? Amazon says just two things:
- Echo Spatial Perception
- Bug Fixes