Well, HiFive has been repaired. Firmware 15.3 is available for download again.
The bug was between the two different bluetooth modules from the two versions between 3.1 and 3.0. The differences are minor, and not many can recognize them. But there is a strangeness with the bluetooth communication that we discovered today
The great thing about the 15.3 binary is the file size. It's 22,200... So as the chinese say, good things come in 2's ... Let's hope this is the one! I think you'll be very happy with this new firmware.
If you had been a victim of the buggy 15.3, it'll be a bit of trouble. You'll need to recycle the power quickly once to receive a pulsating LED, rather than the steady LED.