First, make sure you have EV3 software from LEGO. Once you have it launched up, go to Tools and select Firmware Update. Next to Online Updates, click Check. Then, click Browse. Select the firmware and then click Open. Connect (via USB) your LEGO creation. Under Firmware, click Download. Watch the progress. Once it's done, you'll… Continue reading Install firmware using LEGO MindStorms
For the odd computer here and there I've had LEGO Mindstorms get stuck on the splash screen (we're talking 10-15 minutes or more). A bit of trouble, but I've found going to /Library/Internet Plug-Ins and deleting the Silverlight.plugin, then reinstalling both Silverlight and LEGO Mindstorms seems to fix it.