In Download mode, I am using Heimdall to flash the stock img from Adam's ones here. And it's dailed to obtain the PIT from the watch.
sudo heimdall print-pit --verbose --usb-log-level debug
[28.431346]  libusbx: debug [usbi_handle_transfer_completion] transfer 0x7fe69840bff0 has callback 0x103e89452 [28.431355]  libusbx: debug [bulk_transfer_cb] actual_length=0 ERROR: libusb error -7 whilst sending packet. ERROR: Failed to send request to end PIT file transfer! ERROR: Failed to download PIT file! Ending session... [28.431399]  libusbx: debug [ep_to_pipeRef] converting ep address 0x01 to pipeRef and interface
I am not sure if my Mac running OS X 10.10 DP 5 is the problem or not. Right now, i need the PIT file to test to see how it goes further.
Please help, thank you so much.