Kindly help me please if anyone know how to upload bootloader in mega2561, so please share every step from starting to successfully upload.
I will very thankful for you.
Have you had a read here:
It's some complicated... Could you share other sources... Actually few time ago I have find USBasp device AVR programmer, so this will help or not
It should (though I do not have experience with it). A programmer is the only way to burn a bootloader.
You will need to have the SPI pins of the 2561 plus reset accessible to connect to the USBasp.
You can obtain the bootloader from the link provided by @markd833 or you can build your own.
USBasp is a programmer device you will need to upload the bootloader or any other like AVRISP, Atmel-ICE, etc.
Use the following AVRDUDE command to program the bootloader:
avrdude -c usbasp -p m2561 -U flash:w:your_bootloader.hex
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