Audiomoth won't get into flash mode

Hi all,

I'm trying to update my Audiomoth's firmware to 1.3.0 (currently using 1.2.1). I downloaded the Flash App and followed the instructions to manually switch to flash mode but I end up with a "No AudioMoth found" status at the end of the instructions, after both leds go off using the paperclip:

The steps I follow are the following:

1- Set the switch to CUSTOM

2- Remove the 3 batt's (both led's are flashing)

3- Connect the PROGRAM contacts with a paperclip until led's go off

4- The instructions show No AudioMoth found on the current status. It's also said verify connection

For some reason, I hear the usb disconnection sound on my laptop a few seconds after I get to step 4 and leds start flashing again.

I'm using Windows 8 64 bits.

Any ideas what is causing this problem?

Many thanks in advance,

Rob