• And here is the log when I connect with openocd:

    Open On-Chip Debugger 0.11.0+dev-00515-g1ad6ed38b (2021-12-02-15:52)
    Licensed under GNU GPL v2
    For bug reports, read
    	http://openocd.org/doc/doxygen/bugs.html­
    DEPRECATED! use 'adapter driver' not 'interface'
    DEPRECATED! use 'bcm2835gpio peripheral_base' not 'bcm2835gpio_peripheral_base'
    DEPRECATED! use 'bcm2835gpio speed_coeffs' not 'bcm2835gpio_speed_coeffs'
    DEPRECATED! use 'bcm2835gpio swd_nums' not 'bcm2835gpio_swd_nums'
    DEPRECATED! use 'adapter speed' not 'adapter_khz'
    Info : BCM2835 GPIO JTAG/SWD bitbang driver
    Info : clock speed 1004 kHz
    Info : SWD DPIDR 0x2ba01477
    Info : nrf52840.cpu: Cortex-M4 r0p1 processor detected
    Info : nrf52840.cpu: target has 6 breakpoints, 4 watchpoints
    Info : starting gdb server for nrf52840.cpu on 3333
    Info : Listening on port 3333 for gdb connections
    Error: Wrong parity detected
    Error: Wrong parity detected
    Info : SWD DPIDR 0x2ba01477
    Info : SWD DPIDR 0x2ba01477
    Info : SWD DPIDR 0x2ba01477
    Error: Wrong parity detected
    Error: Wrong parity detected
    Info : SWD DPIDR 0x3ba01476
    Error: Wrong parity detected
    Info : SWD DPIDR 0x2ba0146f
    Error: Wrong parity detected
    Error: Could not find MEM-AP to control the core
    Info : SWD DPIDR 0x2ba01477
    Error: Target not examined, reset NOT asserted!
    
    Info : Listening on port 6666 for tcl connections
    Info : Listening on port 4444 for telnet connections
    
    > targets
        TargetName         Type       Endian TapName            State       
    --  ------------------ ---------- ------ ------------------ ------------
     0* nrf52840.cpu       cortex_m   little nrf52840.cpu       halted
    
    > flash banks 
    #0 : nrf52840.flash (nrf5) at 0x00000000, size 0x00000000, buswidth 1, chipwidth 1
    #1 : nrf52840.uicr (nrf5) at 0x10001000, size 0x00000000, buswidth 1, chipwidth 1
    
    

    --> No idea why it tells me. that there are 6 breakpoints and 4 watchpoints...

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