Rebuilding Bootloader

Hi there! I have recently had the need to rebuild the boot loader on the MKRNB 1500, and I followed the instructions here: Updated Guide for easy rebuild of the bootloader on MKR Boards with a second MKR (WITHOUT SD Card)

After flashing the device, the boot loader still doesn't work. The LED turned on twice, and said it was connected in the Arduino IDE. Both times, trying to upload a simple sketch caused the LED to turn off, and my computer could not find a connection anymore. I tried repressing the RESET button, as well as re flashing. Anyone have any ideas? Thanks!

Try the double click on the reset button. It should start then to slowly dimm on/off. If not, the bootloader is not properly installed.

This worked the first time I flashed it, then when I tried to upload, it didn't work again. I tried re flashing and it worked again, then the same thing happened. I am going through the installation instructions the same way, and it says that the flash completes. I am not sure where I am going wrong.

Also I have some other questions about the boot loader. My application for the board requires the board to be self-sufficient for a period of a couple days, meaning I cannot upload new code to the board over this period. If just uploaded once, when the device restarts, will this mess anything up since the code is running from the boot loader and not the main board?

Also, it is currently flashing, and my computer says it's connected. when I go to upload a sketch, it'll stay connected until it tries to finish the upload, then it can't.

Check proper power supply. Check/change the USB cable. Sounds ridiculous but it's not.

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