The latest development release updates the ER-X to kernel 4.4, which is LTS until at least 2022. The base OS is updated to Debian Stretch also. I think that's

The latest development release updates the ER-X to kernel 4.4, which is LTS until at least 2022. The base OS is updated to Debian Stretch also. I think that's a pretty good level of support for a $49 device.