If you own a OnePlus Ace 2V or Nord 3 stuck in FastBootd mode, then this article will help you get you out of it.
Open device manager in your computer. You will find a yellow colored device named “ossi” with exclamation mark on it, showing that there is some issue with your OnePlus Ace 2V / Nord 3.
Right click and click update drivers -> pick from a list -> Android phone -> Android bootloader interface and install it.
Make sure not to set up Google recognition during setup as it may cause freeze and lags. In case you previously had the IMEI patched, you Willa gain have to get it patched again. This can be done from the shop you bought it from.