We have a Dell XPS 15z. It has had two issues. First an internet connectivity issue solved when we got a new router from Verizon. But now, when we type an email, the cursor jumps to the top and we have tried to disable to touch pad with no success. We don't have this issue when typing in elsewhere, e.g., Word. This is driving my wife crazy and it would me also if I used that laptop. Please help.
Note: While flashing BIOS connect the Ac adapter and make sure the battery has minimum 15% charge as this needs uninterrupted power supply. Do not use the system till it restarts and comes up to the desktop.