When I am using SAM-BA 2.15, I am able to connect to SAMD21 Xplained Pro kit and load the application code. But when I am using SAM-BA 2.18, I am not able to connect to the board, it only recognizes the port. Currently, I am just trying out with the bootloader hex file and led application provided on the website. The one thing I changed was that in the flash_app_main.c file, the MONITOR_SIZE macro was modified to 0x2000 to match the Application Start address. I also updated bin file by running 'Make' and copying it to \tcl_lib\samd21_xplained_pro folder. Please help.