Here our guide to reinstall the System Software on the Dell Latitude E5440 with the including specs.
Before You Begin
1 x Dell Latitude E5440
1 x Dell 65W AC Adapter with 6-foot cord
1 x 16GB USB Flash Drive (Microsoft Windows)
1 x 16GB USB Flash Drive (Apple macOS)
1 x 8GB USB Flash Drive (Bootloader and Post Installation)
2 x DVD disc
1 x USB WiFi Adapter
1 x Bluetooth Adapter
1 x Bluetooth or Wired Keyboard
1 x Bluetooth or Wired Mouse
1 x Smartphone or Tablet with Internet
1 x HDD/SDD or Second PC with Internet
1 x SATA to USB Enclosure
I have access to an iMac/MacBook
(a) Place your drive into a SATA to USB Enclosure.
(b) Connect to an iMac/MacBook and install a macOS version that both devices can support.
(c) Add the Bootloader to a USB Flash Drive