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1. Phillips screwdriver, small slotted screwdriver, U disk, computer;
2. Buy RS232 TTL to USB serial cable; 
3.TTL driver installation: ch340g.zip (3.39 MB,), decompress and install the driver;
5. Download putty: putty.zip (280.1 KB, ), unzip to open;
6. Download sofa butler market (http://) and sofa butler desktop (http://app.shafa.com/apk/shafazhuomian.html) were renamed "sfgj.apk", "sfzm.apk" and copied to U disk
Start cracking:
1. Remove the two foot pads on the bottom of the YMB0300-HX box first, and then use a Phillips screwdriver to remove the screws; 
According to the order in the figure can be set, COM behind the number according to their computer's digital input, set the completion of choice open, then the set-top box power on the box, then putty will start running code (Note order: must first "Open" , And then the box power on, otherwise it does not run yards); 
7, start typing the following command
Cd /mnt/sda/sda1
Pm install dbsc.apk
Pm install dbzm.apk
Successful installation will show "Success";
Sh ymb0300.sh
Then the YMB0300-HX box restarts, gains root privileges and free online installation of application permissions, and can be successfully cracked;
8. After successful cracking, you can boot the sofa and start the housekeeper. 
Yue me YMB0300-HX installs third-party applications to watch TV through U disk
Preparation tools: 2. Use a small screwdriver to pry open the shell of YMB0300-HX. Pay attention to the red frame. Use a screwdriver to hold it in the seam, and then pry it out to open it again. The technique must be delicate and careful to avoid scratching; 3. RS232 wiring, from left to right: 2 = RX 3 = TX 5 = GND; 4. The wiring at the box; 5, after installing the TTL driver, right-click My Computer - Properties - Device Manager - Port - COM "X" (X is the last digit) - Properties - Port Settings - changed to "115200 "--determine; Open previously downloaded putty.exe 6, then insert the box into power, power, putty interface began to run at this time command, if you do not run the command, your line may be connected wrong, try the TX and RX lines alternately, and then re-power again; Box information