The most stable version for Windows 10 64-bit is Driver version 7.35.355.0 (released late 2018) or newer (e.g., 7.35.362.1). Avoid early Windows 10 drivers (version 6.x) as they are unstable.
Do download drivers from random "driver update" websites. Instead, follow this process: Bcm43142a0 Driver Windows 10 64-bit Dell
Before purchasing, verify your laptop does not have a soldered Bcm43142a0 chip (most Inspiron 15 3000 series have mini-PCIe slots, while some ultrabooks have soldered chips). The most stable version for Windows 10 64-bit
For security and compatibility, it is recommended to download drivers exclusively from the Official Dell Support Site Identify Your Model : Use your Service Tag follow this process: Before purchasing