Might be rebar or other reinforcement in the wall. See if you can shine a light on the hole and see what you are hitting. You might have to vacuum or blow the dust out first.
So March is just eels?
Did you mean to type seize?
This is a microsd card inside an SD adapter, that is then inserted into an SD reader in your windows machine right? Some of those SD adapters have a little lock tab that makes the card read-only. Make sure that’s in the correct position.
I would imagine this is the drop off point for that trek. The top of Everest is over double the altitude.