Problem:
I was trying to update Lonsdor K518, it stops at 31% and give me error “Update failed , APK Version : V1.5.17”
Solution:
Flash the APK following steps below:
1.Download and unzip the attached file, you will get 2 files
2.Install 
then open the app 
3. Use a USB cable to connect your Lonsdor 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.
If you have “Run App failed, unknown error” , try to flash APK.
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