hcitool lescan shows I/O error

Question

I\'m trying to do a lescan using hcitool on the raspberry pi.

The command prints out

Set scan parameters failed: Input/output error. 

Answer 1

I am using Version 5.53 I have two Bluetooth devices (hic0 and hic1) I tried all kinds of ways to to reset the devices ... The only way that worked was to physically unplug and re-insert the hic1 dongle. This is the one that supports ble. Then it works until I reboot. I really wish there was a pure software solution way to do this.