unable to flash on bt 40

[lalith88]

-- west flash: rebuilding
[0/16] Performing build step for 'tfm'
ninja: no work to do.
-- west flash: using runner nrfjprog
-- runners.nrfjprog: reset after flashing requested
-- runners.nrfjprog: Flashing file: c:\Users\lnaik\Desktop\New_develop\build_1\zephyr\merged.hex
[error] [ Client] - Encountered error -104: Command erase_file executed for 133 milliseconds with result -104
[error] [ nRF53] - Failed while performing 'Erase' operation on target address 0x00000000.
-104: JLinkARM.dll ReadMemU32 detected a read error 1.
This typically indicates the read was blocked by a memory protection mechanism.
[error] [ nRF53] - Failed while erasing device. -104: JLinkARM.dll ReadMemU32 detected a read error 1.
This typically indicates the read was blocked by a memory protection mechanism.
[error] [ Worker] - JLinkARM.dll ReadMemU32 detected a read error 1.
This typically indicates the read was blocked by a memory protection mechanism.
ERROR: nrfjprog failed for an unknown reason. Run the same command again with
ERROR: argument --log, contact Nordic Semiconductor and provide the generated
ERROR: log.log file to them.
NOTE: For additional output, try running again with logging enabled (--log).
NOTE: Any generated log error messages will be displayed.
FATAL ERROR: command exited with status 65: nrfjprog --program 'c:\Users\lnaik\Desktop\New_develop\build_1\zephyr\merged.hex' --sectorerase --verify -f NRF53 --coprocessor
CP_APPLICATION --snr 1050060012 
I dont kn ow what was the issue but i am unable to flash the code into the customized one can you replay quickly 

[Kazi Afroza Sultana]

Hello,

The error seems related to memory protection issue which is common error. This is likely due to APPPROTECT, SECUREAPPROTECT or ERASEPROTECT being enabled on nRF5340. 

You can try to use west flash --recover or can use nrfjprog command to recover both application and network core.

First, you have to recover the application core

nrfjprog --recover --coprocessor CP_APPLICATION

Then network core

nrfjprog --recover --coprocessor CP_NETWORK

Then try flashing the program.

If you have custom device, they you have to make sure device is properly powered (Programming an external board).

Thanks.

BR

Kazi