Could not read ARM memory - ARM Cortex M7

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I use SWD debugger of SAME70 Xplained with Atmel Studio. I first had "Failed to launch program. Could not activate interface". I reset the MCU. Now I obtain "Could not read ARM memory". I tried chip erase (3.3V on PB12) without success. I tried other example projects. Any suggestions? Many thanks.

Last Edited: Sat. Mar 30, 2019 - 11:00 AM