Uploading problem in vidor 4000

I downloaded the arduino program from the following link and tried to upload the sketch on vidor 4000 board, it worked for the first time. but when i tried to reupload the same code the device is going to bootload mode. how to prevent it happening. or is the any better solution?

Does the problem still occur when you upload the basic File > New sketch to the board?

The reason I ask is because if it is specific to a particular sketch, then you will know that there is something in the sketch code that is causing the problem. After that, you at least can focus your troubleshooting efforts on that code.

It happened to same sketch and also different sketch as well. anyway i could solve the problem:

i had to update samd_bootloader.

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