CCS/CC2640R2F: ----[HELP] emulator version over 7.0.48.0 always fails XDS110 debugger

Tool/software: Code Composer Studio, version 8.x, OS: win10, gentoo linux

CCS Version: 8.x

emulator version  7.0.48.0 worked well.

emulator version over 7.0.48.0 did not worked, or not work well.

emulator version  8.0.903.4  can not load file to the cc2640r2f if the soc have been loaded an image. and console shows the following error message:

Cortex_M3_0: GEL Output: Memory Map Initialization Complete.
Cortex_M3_0: GEL Output: Board Reset Complete.
Cortex_M3_0:   Command=20 -- addr=0x00001000 -- length=0x00001000
Cortex_M3_0: File Loader: Memory write failed: Timed out waiting for target flashloader to execute command.
Cortex_M3_0: GEL: File: G:\ti\workspace_v8\simple_peripheral_cc2640r2lp_app\FlashROM_StackLibrary\simple_peripheral_cc2640r2lp_app.out: Load failed.

using flash programer 2 to erase all unprotected pages, then debugger could load file again. 

is there a way to configure emulator in ccs to erase the soc before load file to resolve this problem?

Cortex_M3_0: GEL Output: Memory Map Initialization Complete.
Cortex_M3_0: GEL Output: Board Reset Complete.
Cortex_M3_0:   Command=20 -- addr=0x00001000 -- length=0x00001000
Cortex_M3_0: File Loader: Memory write failed: Timed out waiting for target flashloader to execute command.
Cortex_M3_0: GEL: File: G:\ti\workspace_v8\simple_peripheral_cc2640r2lp_app\FlashROM_StackLibrary\simple_peripheral_cc2640r2lp_app.out: Load failed.