Double Power Tablet model DP7856K not a supported device in Calibre

[Charles]

Computer OS: Linux Mint 17 (64bit)
Calibre version 2.22
Tablet not recognized as device but computer sees both device storage and additional SDCard (64GB)
Tablet is Double Power (DoPo) model DP7856K (Quad Core A31 16GB onbord)
Android version: 4.4.2
Firmware version: 4.5_20140324
Build number: A31S_Q7911L3B2C_OGS_79D4.20140606

Calibre debug info with device CONNECTED is between lines of ***:

******************************************
calibre 2.22 isfrozen: True is64bit: True
Linux-3.13.0-37-generic-x86_64-with-debian-jessie-sid Linux ('64bit', 'ELF')
('Linux', '3.13.0-37-generic', '#64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014')
Python 2.7.9
Linux: ('debian', 'jessie/sid', '')
Successfully initialized third party plugins: Find Duplicates && Extract ISBN
USB devices on system:
[['0xa5c', '0x5800', '0x101', u'Broadcom Corp', u'5880', u'0123456789ABCD'],
 ['0x18d1',
  '0x6',
  '0x233',
  u'USB Developer',
  u'Android',
  u'44944d354926c930207'],
 ['0x5ca',
  '0x181c',
  '0x1228',
  u'CN0CJ3P27248715Q013RA01',
  u'Laptop_Integrated_Webcam_FHD',
  u'']]

No disabled plugins
Looking for devices of type: MTP_DEVICE
Unknown device USBDevice(busnum=2, devnum=9, vendor_id=0x18d1, product_id=0x0006, bcd=0x0233, manufacturer=USB Developer, product=Android, serial=44944d354926c930207) claims to be an MTP device
MTP devices connected:
USBDevice(busnum=2, devnum=9, vendor_id=0x18d1, product_id=0x0006, bcd=0x0233, manufacturer=USB Developer, product=Android, serial=44944d354926c930207)

Trying to open: USBDevice(busnum=2, devnum=9, vendor_id=0x18d1, product_id=0x0006, bcd=0x0233, manufacturer=USB Developer, product=Android, serial=44944d354926c930207)
Opening device failed:
Traceback (most recent call last):
  File "site-packages/calibre/devices/mtp/unix/driver.py", line 147, in debug_managed_device_detection
  File "site-packages/calibre/devices/mtp/driver.py", line 123, in open
  File "site-packages/calibre/devices/mtp/base.py", line 24, in synchronizer
  File "site-packages/calibre/devices/mtp/unix/driver.py", line 216, in open
OpenFailed: Failed to open USBDevice(busnum=2, devnum=9, vendor_id=0x18d1, product_id=0x0006, bcd=0x0233, manufacturer=USB Developer, product=Android, serial=44944d354926c930207): Error: Unable to open MTP device with busnum=2 and devnum=9, tried 1 such devices

Looking for devices of type: SMART_DEVICE_APP
All IP addresses {'lo': [{'netmask': '255.0.0.0', 'peer': '127.0.0.1', 'addr': '127.0.0.1'}], 'eth0': [{'netmask': '255.255.255.0', 'broadcast': '192.168.128.255', 'addr': '192.168.128.35'}]}
No device is connected

Looking for devices...

Devices possibly connected: None
*****************************************************

Debug info with device DISCONNECTED is below:

calibre 2.22 isfrozen: True is64bit: True
Linux-3.13.0-37-generic-x86_64-with-debian-jessie-sid Linux ('64bit', 'ELF')
('Linux', '3.13.0-37-generic', '#64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014')
Python 2.7.9
Linux: ('debian', 'jessie/sid', '')
Successfully initialized third party plugins: Find Duplicates && Extract ISBN
USB devices on system:
[['0xa5c', '0x5800', '0x101', u'Broadcom Corp', u'5880', u'0123456789ABCD'],
 ['0x5ca',
  '0x181c',
  '0x1228',
  u'CN0CJ3P27248715Q013RA01',
  u'Laptop_Integrated_Webcam_FHD',
  u'']]

No disabled plugins
Looking for devices of type: MTP_DEVICE
No MTP devices connected to system

Looking for devices of type: SMART_DEVICE_APP
All IP addresses {'lo': [{'netmask': '255.0.0.0', 'peer': '127.0.0.1', 'addr': '127.0.0.1'}], 'eth0': [{'netmask': '255.255.255.0', 'broadcast': '192.168.128.255', 'addr': '192.168.128.35'}]}
No device is connected

Looking for devices...

Devices possibly connected: None

[Kovid Goyal (kovid)]

According to that log libmtp is failing to connect to your device.
Nothing calibre can do about it. You can try resetting your device, or
use one of the wireless methods to connect to android devices, described
here:
http://manual.calibre-ebook.com/faq.html#how-do-i-use-calibre-with-my-android-phone-tablet-or-kindle-fire-hd

 status invalid