I bought a dead A1278 the motherboard was no good, so bought a second hand one and got it going. Safari, the App Store won’t update and various others, I can get Google and can download some things, but not the two I mentioned, could this be to do with security certificates, the only way I can think of would be to download to a usb an update, but would I be able to instal it, anybody any ideas please. As it seems very strange that some programs won’t run just a blank page.