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CC2640R2F: CC2640R2 BLE 5 Off-Chip OAD problem

Part Number: CC2640R2F

Hello,

I am using following for off_chip OAD

1.CC2640R2F custom board

2.external flash memory MX25R1635

3.CCS 7.4 version

4.SDK version 1.40.00.45. 

I changed macro CC2640R2_LAUNCHXL_SPI_FLASH_CS  from PIN_UNASSIGNED to IOID_22 in CC2640R2_LAUNCHXL.h  file.

aslo i changed  scan response data to"SimpleperipheOAD".

and programmed  Off-Chip example program to my CC2640R2F custom board . 

Using BTool I establish connection to my CC2640R2F. I select OAD to External Flash and then start the OAD Process. After completion of  OAD, i restart the device and reconnect  using btool and check the scan response data of my device and stil it is showing "SimplePeripheral", means the Off-Chip OAD did not happen but it is showing OAD successful.

What needs to be do to achieve a successful Off-Chip OAD?