Update Advanced_ATmega_Serial_Uploader.md

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#ATmega Serial Uploader
# ATmega Serial Uploader
Mike Blandford adapted the optiboot bootloader for the 4-in-1 module to allow flashing of the module using a standard Arduino USB to serial adapter or FTDI adapter. No need to open the module case. Once set up is very easy to use:
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This bootloader is for reading and writing the flash only, the EEPROM is not supported, neither is reading/writing the fuses, but it only uses 512 bytes of flash.
##Install the bootloader
## Install the bootloader
To get the bootloader onto the ATmega you need to connect an flashing tool (like USBasp) to the 6-pin ISP connector on the board.
Simply flash the .hex file to get the bootloader on the chip, and change the high fuse at the same time.