Also, you should be able to just do a factory restore on the device which doesn't require any special , as opposed to flashing. If you don't have access to the OS, most, if not all android devices (just like phones) should have a way to boot into a recovery/bootloader/safe mode. I had to deal with a lot of these when I repaired Galaxy Tabs. When you power the unit on you had to hold power button and volume up, then release the power button while continuing to hold volume. I've also had to do the same on my HTC.
This of course, as with flashing wipes all customer data. Not recommended if it is vital, but will remove lock screen.
Should be able to google the device and recovery mode or factory restore.
Good luck, hope this helps.