System software
The most recent "5500 Series" ReplayTV units had the ability to stream shows to another similar ReplayTV unit within the same local network, but when loaded with up-to-date system software they can no longer transfer shows to other ReplayTV units across the Internet. The "5500 Series" units have also had the automatic commercial advance feature removed in favor of a manual "Show|Nav" feature. The units are otherwise identical to the "5000 Series" units. System software releases prior to version 5.1 build 144 retain the original features even in 5500-series hardware devices, but the software is automatically updated to 5.1 build 144 via through-the-web software updates.