neoflyer Said:
"can't t reset passcode for macbook: Unfortunately, I am on a trip and don’t have an Ethernet cable with me. Even if I did my router, actually a cellular hotspot, doesn’t have an Ethernet port."
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Three Things:
A. Network Resources being Swollen:
If you are on a Trip, then it's probably the network you are using them. If a public LAN, then you may be using too much of their resources (in which case, they kick you right off the network, and you'd have to get a new ticket to log back in). Remember: There is only so much that Broadband can handle.
B. Wi-Fi Connection:
What's n the top-right cornet of the screen? Does it show that there is a network connection?
C. Using Ethernet:
If at a friend's house, you could you Ethernet through use of an adapter. Get one at your local retailer. Or, if there for weeks to come, then order one from Apple, and have it shipped there.
Use this Connector: Belkin USB-C to Gigabit Ethernet Adapter - Apple Support