I want to upgrade my Dell latitude E6510 i7(1st generation).

But not sure what upgrade to be considered.

I thought to put up a SSD but don't know does it support NVM SSD or Sata SSD also which companies SSD are best to be used?

I also have a issue with the mic as it is not working what can be done for it?

Does the laptop comes with Bluetooth are there any external Bluetooth device as it's Bluetooth is not shown on device?

Kindly if anyone can solve my queries help me out