https://phys.org/news/2019-03-max-anti-stall-software-ready-sources.html

"Boeing has already finalized the necessary corrective measures for the MAX," a source told AFP on condition of anonymity.

The upgrade has yet to be approved by the Federal Aviation Agency (FAA), one of the authorities that grounded the 737 MAX after two deadly crashes in five months, the latest in Ethiopia on March 10.