Tau Leng, Director of Technology on a server manufacturer, Supermicro, says in an interview with The information that Apple resigned its multi-year contracts with the company and sent back a number of supplied servers in the middle of 2016.
The reason is said to be a faulty firmware update had made their way into the servers, and that Apple is no longer trusted the internal security of Supermicro. Leng says to the site to Supermicro asked Apple to check the firmware version on their servers to see if the faulty software had been installed, but Apple gave an invalid number and refused to give the company more info.
The servers in question should have been used App Store search function and parts of Siris infrastructure. Leng says that thousands of customers using servers with the same hardware that could be affected, and Apple was the only one who took such a drastic decision.
In March last year it was reported that Apple had begun to invest in building their own servers, including because the company had suspected that third-party servers had stopped on the road during delivery and received extra chip or another to be able spied on.