after much work, finally I got my PW1 back to life!
I follow the steps from:
https://gist.github.com/TobiasWooldr...ca75190b9a473f
but after reboot, it still stuck at same place.
the last thing I done is touch a DO_FACTORY_RESTORE file into the USB drive, and reboot. It works!!!
here is where I found it
https://www.mobileread.com/forums/sho...d.php?t=223067
Thanks Knc1 for providing me so much useful information!