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LAUNCHXL-CC26X2R1 BTool error

Other Parts Discussed in Thread: LAUNCHXL-CC26X2R1

Hello,

I want to use BTool with the LAUNCHXL-CC26X2R1 as described in "Task 2" from this link: https://dev.ti.com/tirex/explore/node?devtools=LAUNCHXL-CC26X2R1&node=A__AJfAa5knnYceGpWKAKQqcg__com.ti.SIMPLELINK_ACADEMY_CC13XX_CC26XX_SDK__AfkT0vQ__LATEST

The board is flashed with the host_test_app.hex. When I start the BTool and select the device:

I am receiveing an error:

I checked speed of serial port in my computer and set it to the same speed as in BTool, but it didn't help...

Whan can be the reason of that problem and how to solve it? Thanks!