After two deadly crashes in five months, Boeing Co. is embarking on a campaign to restore confidence in the 737 Max so that its best-selling jet can return to the skies.

In Renton, Washington, the company is gathering customers and news media Wednesday to walk through the details of a software update designed to help pilots more easily avert conditions that investigators have linked to an October disaster in Indonesia. The stall-prevention software is also under scrutiny in a second deadly crash this month in Ethiopia.

Meanwhile, in Washington, the Federal Aviation Administration will brief lawmakers on its oversight of Boeing's fixes to the 737 Max — and how officials plan to scrutinize safety testing more closely in the future.