Damaged 3.3v regulator on Xiao BLE - what could be the cause?

[Seeed_Harrison]

@efm-7

I thought with PD, there had to be a special sort of handshake to raise the voltage PAST the standard 5v….

Hi,
The fact is that, if a power adapter can output 5V voltage, there will be related information marked on it, like this one from Apple. So please check the Dell power adapter you used.