Modern JuiceBoxes (late 2018 to present) - running ZAP (Zentri Application) firmware - can automatically update their WiFi processor (but not the core/safety processor) when new firmware is available. You know you have a ZAP box if your Setup network has no password ("JuiceNet-###").

Older JuiceBoxes (late 2015-late 2018) run the basic ZentriOS core firmware, with no application - acting as "dumb modems" to stream real-time data to the cloud UDP server. These boxes have a Setup mode network with the password "GoElectric" - as written in the manual. Many of these can be updated to ZAP - but read on to why you might not want to.

The web setup application was removed from ZAP-based firmware for unknown reasons around mid-2020. This makes it near impossible to set up WiFi outside the EV JuiceNet app, or to save correct settings when the app is incorrectly saying they're not valid, or to connect to a hidden network. It's hard to say if updating is a good thing anymore.

Even older JuiceBoxes (2014-2015) have the basic ZentriOS core firmware, but run on older AMW006 modules - in JuiceBox v8.12 and older. These can't be upgraded, and many are stuck with the version they have - though they can be updated to point to a new server, the core processor may not be speaking a modern protocol language.

Finally, the very first Kickstarter-era (2013-2014) JuiceBoxes have a Roving Networks WiFly module inside. These can be updated all the way to talk to the modern JuiceNet, but ... it takes wizard skill. Wizard training may come in the later pages of these guides!