[ROM] Need Smart+ A4 4G 7" Tablet ROM or Tablet Root Procidure.

[khipk]

Want Tablet ROM or Tablet ROM Root Procedure,
i try to root through OneClickRoot, KingoRood Etc. but all Software fail to root.

CPU-Z Info
Smart+ A4 4G 7" Tablet
Manufacture: ROCO
Brand: Smart+
Board: LF705
Hardware: MT6735

Tablet Specification
Brand: Smart+
Model Number: A4
Operating System: Android 6
Screen Size: 7 Inch
RAM Size: 2GB
ROM Size: 16GB
Display Type: IPS
Front Camera: 2 MP
Rear Camera Resolution:5 MP
Storage Capacity: 16 GB
Cellular Network Technology: 4G
Dual SIM: Yes

If any one have available ROM file or have any solution for root help me.
Thanks for your time.