Older 1st generation Bolt Sidekick receivers will not update the Controller firmware, and will continue to show version 1.9 even though the Controller version listed in the firmware package shows a higher version number such as version 2.2.
However, 1st generation Sidekick receivers that have been manufactured more recently will be able to update to newer Controller firmware versions.
There is no change in functionality from version 1.9 to the more recent Controller firmware releases. This is just an internal product update that allows the more recently-manufactured Sidekick units to use a different flash memory component.
All device specifications and operation is identical between the older and the newer 1st generation Sidekick units, regardless of Controller version.