Hi there!
I have a Dell Latitude 5420 / ST: FC2JQF3 / GDF40 LA-K491P / Rev: 2.0 (A01) / 2020-11-16 / i5-11 model.

My client told me it ran out of battery while updating BIOS (yes, it did) and now seems more like a brick.

I have some doubts about this one:
It charges using a USB-C plug adapter and I have an asymmetric power source to see the consumption.
I don't know if I can plug it in 20V.
When plugged on 5V and when I try to raise it to 20, it turns out on 7V.
The original adapter is here with me, but It only shows a tiny white light and...