On the understanding that this device may have physical flash damage making it uneconomical to recover and he's prepared to sh!tcan it anyway, let's proceed to play with it and see if any other little tricks work because if we brick it entirely there's not likely to be any repercussions from him it seems.

If possible i'd like to have some background as to how this happened or whether it just suddenly went into a bootloop. For example, ask your friend if just before the problem started had he'd flashed any firmware or other updates to it please? If not, anything else he may have done just beforehand. If it happened out of the blue, then ask if it was running and/or actively navigating or did it happened when he turned it on. A spontaneous bootloop is more likely to be symptomatic of flash damage.

PS: Did you obtain that HWID from connecting to G7ToWin in preboot or some other way?