My MCU is a ATSAMR21E16 of Microchip company.
My board was already manufactured and there is only one MCU as CPU.
I am going to look over the boot load method using USB port which is directly connected to the MCU.
Of course, I have a main firmware and if you can deliver the code of USB bootloader, then I will combine them.
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i have more than 6 years experience in embedded software and hardware development . so i can do your job within a time limit with your satisfaction.