LAUNCHXL-CC2650: How to erase all contents of cc2650 from contiki using command

make TARGET=srf06-cc26xx BOARD=launchpad/cc2650 savetarget
sudo make PORT=/dev/ttyACM0 BOARD=launchpad/cc2650 hello-world.upload

and able to view its output on terminal using following command:

sudo make login PORT=/dev/ttyACM0

But when I try to re-upload the compiled code after making some edits following error is displayed:

using saved target 'srf06-cc26xx'
  CC        ../../../cpu/cc26xx-cc13xx/lib/cc26xxware/startup_files/ccfg.c
  CC        ../../../cpu/cc26xx-cc13xx/./ieee-addr.c
  AR        contiki-srf06-cc26xx.a
  CC        ../../../cpu/cc26xx-cc13xx/./fault-handlers.c
  CC        ../../../cpu/cc26xx-cc13xx/lib/cc26xxware/startup_files/startup_gcc.c
  CC        client.c
  LD        client.elf
arm-none-eabi-objcopy -O binary --gap-fill 0xff client.elf client.bin
python ../../../tools/cc2538-bsl/cc2538-bsl.py -e -w -v -p /dev/ttyACM0 client.bin
Opening port /dev/ttyACM0, baud 500000
Reading data from client.bin
Cannot auto-detect firmware filetype: Assuming .bin
Connecting to target...
ERROR: Timeout waiting for ACK/NACK after 'Synch (0x55 0x55)'
make: *** [client.upload] Error 1
rm client.co obj_srf06-cc26xx/fault-handlers.o obj_srf06-cc26xx/startup_gcc.o

This works fine if I erase the contents of TIcc2650 using SmartRF Flash Programmer software and then try to upload code from contiki using above commands.

Can someone guide how to I can erase the contents directly from some commands instead of using SmartRF Flash Programmer software?