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CCS/CC2640R2F: Memory write failed: Timed out waiting for target flashloader to execute command.

Other Parts Discussed in Thread: LAUNCHXL-CC2640R2, CC2640R2F, LAUNCHXL-CC26X2R1

Tool/software: Code Composer Studio

I am trying to get Bluetooth example projects running on SimpleLink LaunchPad LAUNCHXL-CC2640R2. Specifically I am trying to get Angle of Arrival examples running.

I have followed the instructions given here:

http://dev.ti.com/tirex/explore/node?node=AHYhhuDNTaRXzkOlahOlvA__pTTHBmu__LATEST

I have a fresh installation of CCS 10.1.0.00010, and isntalled the SimpleLink CC13X2-26X2 SDK

I have imported each of the following projects; rtls_master and rtls_slave, both of which successfully build in release and debug.

The problem I have comes when trying to flash these projects to my LaunchPad, in both debug and release I am presented with the following:

Cortex_M4_0: GEL Output: Memory Map Initialization Complete.
Cortex_M4_0: Device revision '0xb' unknown for selected target. Assuming latest known revision: Rev. 2.1.
Cortex_M4_0: GEL Output: Board Reset Complete.
Cortex_M4_0: Target timed out! (Block 0)
Cortex_M4_0: Status 0xFFFFFFFF: Target flashloader has not returned any status. Unknown error!
Cortex_M4_0: Command=20 -- addr=0x00002000 -- length=0x00002000
Cortex_M4_0: File Loader: Memory write failed: Timed out waiting for target flashloader to execute command.
Cortex_M4_0: GEL: File: C:\Users\Steve\workspace_v10\rtls_master_CC26X2R1_LAUNCHXL_tirtos_ccs\Release\rtls_master_CC26X2R1_LAUNCHXL_tirtos_ccs.out: Load failed.

I have attempted this with two different LaunchPads, and I get the same issue on both of them.

I have used Flash Programmer 2 to perform a forced Mass Erase, which claimes to be successfull, but I am still unable to program either board.

Am I missing something obvious? I'm not sure why I am unable to flash the LaunchPads, or what the cause of this error is.