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CC2640R2F: OAD Get Block Size Failed- Unable to perform OAD

Part Number: CC2640R2F


Hello,

I am trying to perform off-chip OAD on CC2640r2f but it has failed. Here is some info about the same:

Downloader: CC2640r2f Launchpad

Target: Custom Board (CC2640r2f with ext SPI flash) ( Using sample simple_peripheral_cc2640r2lp_oad_offchip_app in BLE stack)

OAD Application: BTool (v1.41.21) 

Issue: In BTool Console I get the following error

--------------------------------------------------------------------
[39] : <Error> - 01.01.42.102
OAD Operation Timed Out
Operation Name = GATT_WriteNoRsp_GetOadBlockSizeCmd
--------------------------------------------------------------------
[40] : <Error> - 01.01.42.106
OAD Get Block Size Failed
--------------------------------------------------------------------

Can you please help me out of this issue as it is not getting resolved anyhow.