Use the full firmware with driver for this LCD:
http://www.raspberrypiwiki.com/index.php/Install_the_image_to_your_raspberry_pi
Install driver to this LCD(User manual): 
http://www.raspberrypiwiki.com/index.php/Install_driver_to_7_inch_Cap_Lcd_1024*600

Specifications:

- LCD Type: HDMI TFT

- LCD Interface: USB

- Touch Screen Type: Capacitive

- Touch Screen Controller: STM32-103

- Backlight: LED

- Resolution: 1024 x 600 (Pixel)

- Aspect Ratio: 4:3

- SPI Diver Speed: 16Mhz

Features:
 

1. Compatible with Raspberry Pi 3 Model B/2/B+/A+/B

2. For Raspberry Pi， you can run Raspbian and Ubuntu( Ubuntu can only run at Raspberry Pi 3B/2B)

3. Compatible with BB Black and Banana Pi/Pro

4. Can also run Windows at your PC (Touch can't work)

5. USB touch and HDMI display don't occupy any GPIO

Package included:

1 x Touch Screen

1 x HDMI Cable (50cm)

1 x USB Cable (80cm)

1 x Acrylic Stander Holder