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Installation process 1 Download the sofa butler installation file → 2U disk to connect the TV → 3 TV to enter the file management → 4 read the U disk file → 5 Installation is complete
Steps
1. Baidu search for "sofa manager" into the sofa network, download the sofa butler package; or directly click the link (http://app.shafa.com/shafa.apk) to download the sofa butler package. 
Copy the downloaded apk installation package to the U disk.
2. Change the suffix name .apk to uppercase .APK. (Example: com.shafa.market_4.5.3.apk needs to be changed to uppercase com.shafa.market_4.5.3.APK)
Note: If you do not change the suffix name to uppercase, LeTV 4 X50 Pro TV will not recognize the apk installation package. 
3, the U disk into the music as super 4 X50 Pro, will pop up a prompt box, select to view "all", users who do not pop up this dialog box, you can find "file management", enter the U disk; 
4, from the U disk to find just downloaded the sofa butler package, click to complete the installation. 
If you still can not read the U disk, it is recommended to format the U disk to FAT32 format (if there are other contents in the U disk, export and then format), or try another U disk.
If the installation fails, restart the device and try again by following the steps (may be useful). Still have questions please add the official QQ group below.
LeTV 4 X50 Pro U disk installation application market
LeTV 4 X50 Pro install the sofa butler TV application market through U disk, LeTV TV other models can also refer to this tutorial.
Watch on-demand video on smart TV, recommend using pudding video; Watch live TV, recommend HDP live broadcast; More interesting content, please use Tencent video TV version, TV; Fun smart TV and box, more exciting content in Sofa net.