Link is to the Russian Sputnik report. There are Washington military blogs reporting the same thing, but they are all subscription.
Upgrade is required because the F-35 design is so old and computers advance so fast, even a car is now far more powerful. Tempus fugit.
https://sputniknews.com/military/201...oduction-plan/
https://www.motor1.com/news/174162/f...ng-power-f-35/