我已经把2640R2F 的host_test.bin 转成bin文件，并且重命名为：blinky_backdoor_select_btn2650.bin
+-------------------------------------------------------------
| Serial Bootloader Library Example Application for CC2650
+-------------------------------------------------------------
+-------------------------------------------------------------
| COM ports:
+-------------------------------------------------------------
|Idx | Description
| 0 | USB Serial Port (COM1)
| 1 | USB Serial Port (COM5)
| 2 | XDS110 Class Application/User UART (COM7)
| 3 | XDS110 Class Auxiliary Data Port (COM8)
+-------------------------------------------------------------
Select COM port index: 0
Connecting (COM1 @ 230400 baud) ...
100% (501.00ms)
Erasing flash ...
100% (1014.00ms)
Writing flash ...
Warning: CC2650 bootloader will be disabled.
99% Timed out waiting for ACK/NAK. No response from device.
Error during flash download. Failed to read device status.
- Start address 0x0001FEE4 (page 31).
- Tried to transfer 252 bytes.
- This was transfer 520 in chunk 0.
An error occurred: 3