google pixel error slot unbootable load error

If i check in DeviceManager on Microsoft Windows, the Pixel2 wasn't really detected. When i plug in USB to phone on my laptop, it was not detected and when you right-click on the USB icon to eject, it shows 'Eject Android'- when i eject, it shows 'Android bootloader interface removed'. I tried various ways to reboot but nothing works. I suspect there was an auto-update that had cause this sudden reboot.

The fastboot toolkit seems to recognize my phone but basically none of the command to flash the phone could work. I did searched for different forums and tried different methods but can't find any solution to fix this problem (Seems like there were quite a number of people having same issue within these few months). all attempted failed with error that the phone is locked.

I tried using fastboot/ADB to unlock the phone, to flash with new image, to switch boot-slot from a to b. My phone is still in OEM-locked status (before this issue occur) and i couldn't get into 'RecoveryMode' to perform factory reset. Aside from 'Power Off' & 'Barcode' function all function like Start/RecoveryMode doesn't work- it will eventually return to same screen with Android logo. Few days ago, my Google Pixel2 suddenly reboot by itself & then stuck in screen with android logo with option 'Start', 'Recovery Mode', 'Barcode', 'Power Off'.

Google pixel error slot unbootable load error