Suggestions for Linux-friendly BLE dongle?

Strange. The forums post shows loading rtl8761bu_fw.bin, but my /lib/firmware/rtl_bt directory does not have that file. The closest filename present is rtl8761b_fw.bin.

I found a Linux driver download on the manufacturer's website (http://www.edimax.com). This ZIP file contains a lib/firmware with a rtl8761bu_fw file (not quite the same naming scheme). Then it has lib/firmware/rtl_bt with a handful of other files in it and a lib/firmware/rtlbt with a rtl8761b_fw. This isn't very consistent with the organization of my system's /lib/firmware directory. I can't really make heads or tails of this.