Could it be the case that there are drones with different VID's and PID's? My usb device's PID and VID differ from those that usb_flash seems to be looking for.
UPDATE: Ok, it looks like it was another unknown device after all

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A.R. Drone Flasher
(c) scorpion2k
!!USE AT YOUR OWN RISK!!
Version: 0.0.1
1. Connect your drone via USB to your PC
2. Connect the Battery to your Drone
3. Ensure the drivers are installed and the device shows up in devmgr
4. Press any key to continue
Press any key to continue . . .
*** VERIFICATION ***
Verifying ardrone_usb_bootloader.bin
Verifying ardrone_installer.plf
Verifying ardrone_update.plf
*** BOOTLOADER INSTALLATION ***
Try [00/10] to connect to VID: 0x19cf PID: 0x1000
Found a possible device:
- Manufacturer: Parrot SA
- Product: P6 USB Stage1
- Serialnumber: ?
- Number of configurations: 1
Sending bootloader (0x5b20 bytes)
- Send Hello P6 (0xA3)
Success!!!
Checksum returned: 0x5256 Expected: 0x5256 => OK
Starting the bootloader...
*** INSTALLER INSTALLATION ***
Closing usb connection...
Try [00/10] to connect to VID: 0x19cf PID: 0x1000
Found a possible device:
- Manufacturer: Parrot SA
- Product: P6 USB Stage1
- Serialnumber: ?
- Number of configurations: 1
loading installer
Uploading file: ardrone_installer.plf
Error Code returned: 0x00000000 ==> OK
*** FIRMWARE INSTALLATION ***
Closing usb connection...
Try [00/10] to connect to VID: 0x19cf PID: 0x1000
Try [01/10] to connect to VID: 0x19cf PID: 0x1000
Try [02/10] to connect to VID: 0x19cf PID: 0x1000
Found a possible device:
- Manufacturer: Parrot SA
- Product: Gadget Serial v2.4
- Serialnumber: not defined
- Number of configurations: 1
loading firmware
Uploading file: ardrone_update.plf
Error Code returned: 0x00000000 ==> OK
*** INSTALLATION DONE ***
Hi all,Markus Unread wrote:I'm now trying to use the usb_flash-0.1.0-win32 tool. On a win-XP machine, does anyone know what's going on if the P6 USB Stage1 driver loads but I never get any prompt for the follow-up Serial driver to load? The load fails with "usb_bulk_write failed".
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