What do you mean by "did flush"? If you have an image copied to the Edison's update area (shown as disk drive when you connect it to the Windows computer), then "run do_ota" willl reset the board's OS to the default state, including configurations and passwords. If you don't have that after running the OTA, capture the console output for the whole process (starting with "run do_ota") and post here, we could check what's going on there.
I tried again and it worked. Here are the steps for the Arduino board:
- Get latest Edison Yocto complete image
- Connect PuTTY
- Hold the PWR button till Edison shots down (~8 sec)
- Press the PWR button again to boot Edison
- Hit a key when the Hit any key to stop autoboot message appears (have to be quick)
- Type run do_ota