1. Connect the Keyboard to your tablet. 
2. Ensure that your S20 Tablet is updated to the latest software version (S20-G-Tab-V2.0-20210309.<20210408_2258>

To update your S20 tablet follow below steps

Go to Settings> System> Advanced> System Updates

Check the current version. Click update if needed.

1. Check the software setting and make sure that you did not solve the problem.
2. Check if the speaker is damaged or not. If it is damaged, change a new one.
3. If both the measures still can not work, then you need to check the sound IC on PCBA.

1.If you want to connect to your Android tablet computer but not connecting, how do you repair it?

2.When you want to update your Android tablet via computer but your Android tablet is not connected

3.First you need to check micro-usb. If micro-usb is some kind of damage then you need to change micro-usb

4.After changing micro-usb, even if the computer is not connected then we need to change the USB IC

5.If USB is not connected even after changing, we need to change cpu ic

6.After changing the CPU IC, there will be no more problems.

7.Of course your Android tablet will connect to the computer

1. LCD or LCD FPC cable damaged, need to change new LCD Display.

2. FPC cable lose, need to re-connect the FPC cable.

3. The IC of PCBA has problems, change the IC of PCBA. Normally u can test it through another LCD.

A. Please go to setting menu, set it as following:

Settings —–Developer options —-USB Debugging (Select it)

Mark: For Some of Android version Tablet PC, please continue click “Build Number” 3-4 times, then enter into “Developer Options”

B. It is the problem of the cable, please change another cable and try again.

Dail *#06# on your device, each SIM card slot against 1 IMEI number.

A. Make sure the tablet model is supporting 4G, and the band are working in your country operators.

B. Check if u have switched on the 4G function.