This MCU with ES20 header on second line on QBR5F100SL-TB board.I have some QBR5F100SL-TB boards and MCU have or not have ES20 text on MCU, and if ES20 text presence on MCU some demos not work. What difference in this MCUs?
Here is MCU w/o ES20 text - img.leprosorium.com/2409522