Flash error sometime

[QBSho]

Some time i got this error msg

error] [ Client] - Encountered error -105: Command connect_to_emu_with_snr executed for 40 milliseconds with result -105
ERROR: Unable to connect to a debugger.
[error] [ Worker] - JLinkARM.dll Open returned error 'Cannot connect to J-Link.'
ERROR: The JLinkARM DLL timed out while communicating to the J-Link probe.
ERROR: If the error condition persists, 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 35: nrfjprog --program .....edge/build_1/zephyr/merged.hex --sectoranduicrerase --verify -f NRF52 --snr 1050250697

[error] [ Client] - Encountered error -160: Command verify_file executed for 318 milliseconds with result -160
[error] [ nRF52] - Failed while performing 'Verify' operation on target address 0x00000000.
-160: Data does not match in address range [0x00000000 - 0x000088BD] (Flash)
Expected byte value 0xC0 but read 0x80 at address 0x00001448.
[error] [ nRF52] - Failed while verifying device. -160: Data does not match in address range [0x00000000 - 0x000088BD] (Flash)
Expected byte value 0xC0 but read 0x80 at address 0x00001448.
[error] [ Worker] - Data does not match in address range [0x00000000 - 0x000088BD] (Flash)
Expected byte value 0xC0 but read 0x80 at address 0x00001448.
ERROR: Write verify failed.
NOTE: For additional output, try running again with logging enabled (--log).
NOTE: Any generated log error messages will be displayed.

a recover or earease all helps but not garanteed.

[Kazi Afroza Sultana]

Hello,

''Coding with 2.6.1 and 2.7.0, zephry vs code programming over dk to a RAK4631 SWD.
Board is powered by battery, ground is also over the swd.''

So, the RAK4631 module is programmed by our nRF52840DK. How the DK is powered? when you programmed your module by DK, both should have same power level. have you checked the battery power is same as DK power source? If not change the battery.

''The voltage supported by external debugging/programming is VDD voltage. Normally, this is 3 V when running from USB. But if the onboard nRF52840 SoC is supplied from either USB or lithium-ion (Li-ion) and the nRF power source switch (SW9) is in either Li-Po or USB position, then the VDD can be set by the nRF52840 firmware. Make sure the voltage level of the external board matches the VDD of the nRF52840 DK''. spurce: https://docs.nordicsemi.com/bundle/ug_nrf52840_dk/page/UG/dk/hw_debug_out.html 

 ''zephry vs code programming '' - I am not sure which application you meant here. Buy you can try with a simple application from our samples and check.

Recovering the board would be one option. So, try to use nrfjprog --recover command before flashing.