If you have any technical troubles when using the app, please follow the troubleshooting below.

[Restart the app]
Try restarting the app. You can see how to close the app from the following links.

- For iOS Device
How to force an app to close on your iPhone, iPad, or iPod touch (Apple Official Help)
- For Android Device
Find, open & close apps on Android (Google Official Help)

[Check Your Device Storage]
Make sure that you have enough space available on your device to download a lesson.
Remove downloaded file from the setting menu (gear icon on the top right) and try again.

[Check Your App Version]
Make sure your apphonep is the latest version.
You can check/download the latest version from the following links.
- App Store
- Google Play

[Update Android System WebView]
In Android, please also update your 'Android System WebView' application.

Switching off silent mode
In silent mode, your mobile device will generally not play audio through the speaker.
You can hear the audio by connecting earphones, or by turning off silent mode.

Increasing the volume
If you still can't hear anything after turning off silent mode, your media volume is probably set too low.
Tap a play button so the audio is playing, and immediately adjust your volume up to a suitable volume.

Please reboot your device to reset the temporary issue of the network or memory that may cause the problem.
If that doesn't solve the problem, please try uninstalling the app and reinstall it.
Please make sure to do "sync" from the setting menu.

Try restarting the app. You can see how to close the app from the following links.

- For iOS Device
How to force an app to close on your iPhone, iPad, or iPod touch (Apple Official Help)
- For Android Device
Find, open & close apps on Android (Google Official Help)

Also, make sure that you have enough space available on your device to download a lesson.
In Android, please also update your 'Android System WebView' application.

Make sure your mobile device is connected to the internet and follow the steps below to sync your study data.

1. Open the app, and tap the gear icon at the top right of the screen.
2. Tap 'Sync data'.

If your study data still does not show correctly, log out of the app, and log back in.

Please make sure that you cannot sync the progress of the unfinished lessons.

Make sure your mobile device is connected to the internet and follow the steps below to sync your study data.

1. Open the app, and tap the gear icon at the top right of the screen.
2. Tap 'Sync data'.

If your study data still does not show correctly, log out of the app, and log back in.

You can disable the shake feedback with the following steps.

1. Open the app, and tap the gear icon at the top right of the screen.
2. Switch off 'Shake phone to send feedback'.

The page may be skipped depending on the strength of the tap of the button.
We apologize for the inconvenience, but if you see this issue, we would appreciate it if you could press and hold the button harder.
We are working on the improvement for this issue.

Our support team will help. Follow the steps below to report the problem:

1. Open the app.
2. On the screen where the problem is occurring, shake your mobile device
3. Tap 'Yes please'.
4. Input your name, registered email address, and details of the problem (for example: 'I can't log in!').
5. Click 'Send Information'.

If you have disabled the shake feedback, tap the gear icon on the top right and select "Send feedback".