Just did the initial teardown of this unit, and capture and upload of the photos.   I really like the compact and yet simple design, effective use of the two CI components yields a nice new 2.4Ghz SoC core, along with an RF extender.

The GR-12L gives you 6 channels, and the included HoTT telemetry.

There is a 5-pin debug header on the top side of the PCB, which is the usual Texas Instruments 'CC Debug' header.  I didn't even bother to hook up a debugger at this point, because I am pretty much certain Graupner enabled the 'protection' bits in the CC2510 chip, to prevent any readout of the firmware.