Hi Alex, I'm in a field trip in this moment, I will try again when I'm back home. Thank you! C.

@Alex Rogers Yes, that's exactly what happened. However, 1 or 2 minutes after these LED stopped to flash, they turn on again. So I kept the paperclip over the terminals and continued with the process, but it says again "no serial ports found" :( Can you explain me the purpose of this "flashing" process? The recorder is capable of record in the field without it? Thanks!

Hi Alex, thank you for your quick answer. I continued with the instructions, but when I opened the command window (after use the paperclip and attached the recorder to the computer), it says again: "no serial ports found" :/ I have Windows 10, 1903 version. It's a HP Pavilion 14 Notebook. Best regards, Camila.