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Flashed nRF52 DK mbed bootloader, can't access board through nRFgo Studio.

I flashed the nRF52 DK with the mbed bootloader developer.mbed.org/.../ but I'm having issues with the board. When I drag and drop the file which is a very basic blink program, I get the error, "The file 'Blinky_NRF52_DK.hex' is too large for the destination file system." Then the driver crashes. I know the flash worked because it has drag and drop has worked a few times after so many tries, but it's horribly unreliable. What could be my problem?

I wanted to use nRFgo studio to completely erase the chip maybe it has the softdevice on it, but not I only get the MBED drive and not the Jlink drive in my windows and I don't know how to revert the bootloader.

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