I'm working on a custom board with NRF52805. I have no problem when downloading flash from C segger project. Connecting ‘J-Link’ using ‘USB’ Connecting to target using SWD Loaded C:/Program Files/SEGGER/SEGGER Embedded Studio for ARM 5.20a/bin/JLink_x64.dll Firmware Version: J-Link V11 compiled Nov 12 2020 10:07:08 DLL Version: 6.88a Hardware Version: V11.00 Target Voltage: 3.322 Device "NRF52805_XXAA" selected. InitTarget() start InitTarget() end Found SW-DP with ID 0x2BA01477 DPIDR: 0x2BA01477…