If your Lonsdor K518ise device meet issue like those:”Run APP Failed,unknow error”or”update faild,APK version:v1.5.17″, you can try renew firmware Program on Lonsdor K518ise
1. Download and unzip the attached file, you will get
and .
2. Install 
and then open the app
3. Use a USB cable to connect your K518ISE to a computer.
4. ① Click the button in red first.
② Click the button in black next.
③ Find the file
and click it (marked in
red, step 1).
④ Then click the button marked in black (step 2).
5. Hold on the power key and you will see interface below. Click the
button marked in red. And immediately hold on the volume+ key until
you see a progress bar in the computer.
6. Two windows will pop up, just click YES. 7. Update firmware successfully. Pull out the USB cable and wait the
device to automatically repair.
8. Don’t touch the device. You will see a white screen and there are two
buttons (set up WIFI and update).
9. Set up WIFI and then update. The problem will be solved after
updating.