1. what is the easiest way to fix errors?

 

 

 

pc repair tool will you to scan all the errors from your device. 

2. what is ssu stands for?

 

 

 

ssu stands for servicing stack update.

3. what  sfc stands for?

 

 

 

sfc stands for system file checker.

4. how long will take to turn off xbox?

 

 

 

 

hold the xbox button for 10 seconds until you hear the 2 beep sound.

5. what is the reason for occurring error code 0x80070490?

 

 

 

when your files on the system are corrupted, then error code 0x80070490 will occur.

6. is it important to update the system?

 

 

 

whenever the latest version releases, you need to update your device.