BQ E4.5 adb fails
adb shows a device only when it knows the vendor of the device. The vendor of the bq E4.5 seems not known by default.
To change that edit or create the file ~/.android/adb_usb.ini and add the following line
0x2a47
That is the vendor id of the bq E4.5.
Restart the adb server after you edited the file
sudo adb kill-server; sudo adb start-server
You can find out the id by yourself with lsusb.
(I made the id bold so you can see where to look for it in the lsusb output)
Bus 003 Device 002: ID **2a47**:0c02
(Or you could execute lsusb -v and look for the idVendor field.)