[LittlePete]

If all the above steps fail, go to Preferences->Miscellaneous and click debug device detection with your device attached and post the output in this forum - here it is:

calibre 3.46 embedded-python: True is64bit: False
Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '7', '6.1.7601')
Python 2.7.15+
Windows: ('7', '6.1.7601', 'SP1', u'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (6, 6, 3) && Find Duplicates (1, 6, 3) && Kindle Collections (1, 7, 24) && Read MP3 AudioBook metadata (1, 0, 79)
USB devices on system:
(USBDevice(vendor_id=None product_id=None bcd=None devid=usb\root_hub20&vid8086&pid9c26&rev0004 devinst=3096),
USBDevice(vendor_id=None product_id=None bcd=None devid=usb\unknown devinst=3156),
USBDevice(vendor_id=0x45e product_id=0xdd bcd=0x173 devid=usb\vid_045e&pid_00dd&rev_0173 devinst=3236),
USBDevice(vendor_id=0x45e product_id=0xdd bcd=0x173 devid=usb\vid_045e&pid_00dd&rev_0173&mi_00 devinst=3316),
USBDevice(vendor_id=0x45e product_id=0xdd bcd=0x173 devid=usb\vid_045e&pid_00dd&rev_0173&mi_01 devinst=3412),
USBDevice(vendor_id=0x46d product_id=0xc52f bcd=0x3000 devid=usb\vid_046d&pid_c52f&rev_3000 devinst=3508),
USBDevice(vendor_id=0x46d product_id=0xc52f bcd=0x3000 devid=usb\vid_046d&pid_c52f&rev_3000&mi_00 devinst=3588),
USBDevice(vendor_id=0x46d product_id=0xc52f bcd=0x3000 devid=usb\vid_046d&pid_c52f&rev_3000&mi_01 devinst=3684),
USBDevice(vendor_id=0x4b8 product_id=0x8b8 bcd=0x100 devid=usb\vid_04b8&pid_08b8&rev_0100 devinst=3780),
USBDevice(vendor_id=0x4b8 product_id=0x8b8 bcd=0x100 devid=usb\vid_04b8&pid_08b8&rev_0100&mi_00 devinst=3868),
USBDevice(vendor_id=0x4b8 product_id=0x8b8 bcd=0x100 devid=usb\vid_04b8&pid_08b8&rev_0100&mi_01 devinst=3964),
USBDevice(vendor_id=0x4b8 product_id=0x8b8 bcd=0x100 devid=usb\vid_04b8&pid_08b8&rev_0100&mi_02 devinst=4060),
USBDevice(vendor_id=0x4f2 product_id=0xb3c8 bcd=0x6662 devid=usb\vid_04f2&pid_b3c8&rev_6662 devinst=4156),
USBDevice(vendor_id=0x4f2 product_id=0xb3c8 bcd=0x6662 devid=usb\vid_04f2&pid_b3c8&rev_6662&mi_00 devinst=4232),
USBDevice(vendor_id=0x59b product_id=0x7e bcd=0x1 devid=usb\vid_059b&pid_007e&rev_0001 devinst=4328),
USBDevice(vendor_id=0xbda product_id=0xb001 bcd=0x200 devid=usb\vid_0bda&pid_b001&rev_0200 devinst=4404),
USBDevice(vendor_id=0xc0b product_id=0x336 bcd=0x0 devid=usb\vid_0c0b&pid_0336&rev_0000 devinst=4480),
USBDevice(vendor_id=0x1058 product_id=0x1140 bcd=0x1012 devid=usb\vid_1058&pid_1140&rev_1012 devinst=4556),
USBDevice(vendor_id=None product_id=None bcd=None devid=usb\vid_1949&pid_0c31&rev_???? devinst=6208),
USBDevice(vendor_id=0x2109 product_id=0x2812 bcd=0x9090 devid=usb\vid_2109&pid_2812&rev_9090 devinst=4740),
USBDevice(vendor_id=0x2109 product_id=0x2812 bcd=0x9090 devid=usb\vid_2109&pid_2812&rev_9090 devinst=4820),
USBDevice(vendor_id=0x2109 product_id=0x2812 bcd=0x9090 devid=usb\vid_2109&pid_2812&rev_9090 devinst=4900),
USBDevice(vendor_id=0x8087 product_id=0x8000 bcd=0x4 devid=usb\vid_8087&pid_8000&rev_0004 devinst=4980))

No disabled plugins
Looking for devices of type: MTP_DEVICE
List of WPD PNP ids:
[u'\\\\?\\wpdbusenumroot#umb#2&37c186b&1&storage#vo lume#_??_usbstor#disk&ven_epson&prod_storage&rev_1 .00#9&e5b29ec&0&534559593039363340&1##{6ac27878-a6fa-4155-ba85-f98f491d4f33}',
u'\\\\?\\wpdbusenumroot#umb#2&37c186b&1&storage#vo lume#_??_usbstor#disk&ven_epson&prod_storage&rev_1 .00#9&e5b29ec&0&534559593039363340&2##{6ac27878-a6fa-4155-ba85-f98f491d4f33}',
u'\\\\?\\usb#vid_1949&pid_0c31#g0w116089216f4x8#{6 ac27878-a6fa-4155-ba85-f98f491d4f33}',
u'\\\\?\\wpdbusenumroot#umb#2&37c186b&1&storage#vo lume#_??_usbstor#disk&ven_epson&prod_storage&rev_1 .00#9&e5b29ec&0&534559593039363340&0##{6ac27878-a6fa-4155-ba85-f98f491d4f33}']
MTP device: \\?\usb#vid_1949&pid_0c31#g0w116089216f4x8#{6ac278 78-a6fa-4155-ba85-f98f491d4f33}
{'device_version': u'1.0',
'friendly_name': u'',
'has_bulk_properties': True,
'has_storage': True,
'manufacturer_name': u'Amazon',
'model_name': u'Fire',
'protocol': u'MTP: 1.00',
'serial_number': u'G0W116089216F4X8',
'storage': [],
'type': 'media player'}
Not a suitable MTP device, ignoring

No suitable MTP devices found

Looking for devices of type: SMART_DEVICE_APP
All IP addresses {'{625FFCE7-4DA8-40F8-8639-D82FEA50B74A}': [{'broadcast': u'192.168.0.2', 'netmask': u'255.255.255.255', 'addr': u'192.168.0.2'}], '{53409213-EA5D-44C0-ACD8-D70E501E5180}': [{'broadcast': u'192.168.11.111', 'netmask': u'255.255.255.255', 'addr': u'192.168.11.111'}], '{846EE342-7039-11DE-9D20-806E6F6E6963}': [{'broadcast': u'127.0.0.1', 'netmask': u'255.255.255.255', 'addr': u'127.0.0.1'}]}
No device is connected

Looking for devices...

Devices possibly connected: None