Sorry for not being quite clear in my related writing but it was referring to your laptop’s USB 3.1 Type-C port, the one that you used there for the particular purpose (at that time), and to the quality cable needed in terms it can transport enough current. That USB2.0 cable might and probably should be used (on PC/laptop port) because of its well known charging advantage (its charging wires are of the lower AWG number in most cases when compared to the non-charging-compliant USB3.0 cable), as we already learned this, on this Forum from @dos:
And as quite directly related toward USB-C to USB-C cables (including extension cables in particular, extending something that is not compliant, perhaps):
Therefore I was thinking openly, somewhere on this Forum as well, to have battery capacity at above 80% (but not at 100%) before staring with the reflashing process (putting brand new image on the Librem 5 eMMC)? As related: