Jen has an old Samsung Galaxy mobile phone that was bricked during an over-the-air update. She's also heard that others are having the same problems. What can she do? Samsung doesn't seem to care. Leo says it could just be a bad battery, which she could replace. If that isn't the problem, then the update is the culprit. If she can get into recovery mode, then there's a chance. To do this, she should press the On button and volume up button at the same time and hold it until it gets into recovery mode.
If that doesn't work, then it may just be dead. And if it's out of warranty, there's not much she can do. She may be able to make a case to get support for this. If she wants to be ambitious, she can go to XDA-Developers forum and look try using ODIN to get into the phone to revive it through the firmware. But if it's a hardware failure, it's toast.
The Chatroom offers this link on how to troubleshoot it - http://www.samsung.com/us/support/faq/FAQ00059173/81104
The Motorola Moto G is only $150 unlocked. So if she can't get it back, that's not too much to pay to replace it.