Graupner made an L version of its telemetry HoTT receivers (GR-16L, GR-24L and GR-32L) for a while, which had slightly different software with reduced functionality compared to the non-L receiver version.
The hardware of both receiver models is, however, 100% identical.
The L receiver version is not manufactured anymore and has been replaced by the standard version (GR-16, GR-24, GR-32).
As of 2019, the L models' software limitations were lifted, bringing the L and none L software to the same software release base, making them 100% identical for both hardware and software.
To ensure your L receiver version has the same software as the non-L version, you will need to update the software on your receiver with the latest software version.
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Al Jones
How, specifically, does one access the receiver programming?
Control Hobbies
You can access the RX setting over the telemetry return channel. Look for your telemetry menu on your radio and select Settings and Data View to select the RX settings.