The software believed to be linked to the catastrophic crashes of two new Boeing 737 MAX 8 planes in less than five months is getting a makeover.

Pilots from five airlines, including the three U.S. carriers that flew the MAX jets before they were grounded worldwide, tested upgrades to the flight-control system over the weekend at Boeing’s facility outside Seattle, the aircraft manufacturer confirmed.

Boeing will also host more than 200 airline pilots, technicians and regulators in an informational session Wednesday that’s among the initial steps in its attempt to get the MAX planes back in the air.

Investigators have pointed to the stall-prevention system known as MCAS – Maneuvering Characteristics Augmentation System – as a likely factor in the Oct. 29 crash of Lion Air Flight 610, which killed all 189 aboard when it plunged into the Java Sea off the coast of Indonesia.

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