Radioddity had the new firmware for the X6100. I downloaded it, wrote it, installed it, and rebooted it to see the stock APP 1.1.8 and BASE 1.1.7. That mostly-useless audio spectrum is gone. The strange jump at 63 in RF GAIN is fixed.
BUT transmitting gave NO POWER. R1CBU also exhibited the problem. When I downgraded to BASE 1.1.6, it transmitted again. Others had seen this problem as well, while others had it work. It must have depended upon variations in the hardware.