The 2BS5 software package, which deals with sensors, also continues to run into difficulties. According to the report, "fusion of information from own-ship sensors, as well as fusion of information from off-board sensors is still deficient.
The Distributed Aperture System continues to exhibit high false-alarm rates and false target tracks, and poor stability performance, even in later versions of software."
Most recently, the F-35 program is expected to miss a deadline for releasing the Block 3F software upgrade. Missing the deadline will likely mean that the F-35 won't be ready for its July 2017 deadline.
In short, if the code fails, the F-35 fails.