**PANIC** radio_i 20

Hello to everyone.
I have 433mHz telemetry with 3DR Technology v2.1 written on it.
Unfortunately, telemetries do not see each other. I get no problems installing firmware on one, but the error I get when I try to install firmware on the other is pictured below.

The warning I get when I try to connect with Putty:

Is it an insurmountable problem? Or should I throw the products in the trash?