Updating from 5.3.10 tp 5.3.18 should not erase the current programming in the system. If you were to update from a 4.x.x to a 5.x.x firmware then all current wireless setup would be erased from the system.
Updating from 5.3.10 tp 5.3.18 should not erase the current programming in the system. If you were to update from a 4.x.x to a 5.x.x firmware then all current wireless setup would be erased from the system.