Dell’s Latitude 7420 2in1 business laptop is easy to open.
Just unscrew the 8 screws on the back and then pry off the cover with some prying tool.
Strong nails, may work too.
In this corporate laptop we can easily replace the battery and disk drive. There’s also a free slot for cellular modem.
However, the memory seem to be soldered into the board and is not replaceable.

DELL STORE on Amazon: [ Ссылка ]
All the tools you will need; [ Ссылка ]
Dell Latitude 7420 2-in-1 (2021): [ Ссылка ]
Dell Dock- WD19 130w: [ Ссылка ]
Laptop Docking Station Dual Monitor: [ Ссылка ]

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