I re-solder the F1 fuse back.. This allows the device to sense the USB connection..
after resoldering F1, when I put the device into DFU mode (press user button and plug in usb power) I was able to see the dfu interface on usb (id 0456)..
Then used the firmware and dfu-util to flash the latest firmware
sudo dfu-util -a firmware.dfu -D pluto.dfu
and the device started back to working as normal....
sanother PLUTO recovered
73's de OH2UDS/TA7W