What should be the condition of a device when placing it into preservation mode?

When placing a device into preservation mode, it is crucial that it is in airplane mode with no Wi-Fi. This condition ensures that the device is not actively communicating or exchanging data with any networks, which helps preserve the state of the device and prevents any inadvertent changes or data alterations during the preservation process.

Entering airplane mode disables all wireless communications, preventing the device from receiving updates or messages that could modify its data or configuration. Additionally, turning off Wi-Fi further adds an extra layer of security by ensuring that it is not connected to any local networks that could potentially alter its stored information.

Other conditions, like being turned off with a dead battery, would not allow for effective data preservation as the device must remain operational for the process. Similarly, being powered on and unlocked does not provide the needed protection against data alterations. Lastly, while connected to a charger may keep it powered, that alone does not prevent external communication or alterations, making airplane mode the most appropriate option for preservation.