I'm not sure if it is actually possible to "brick" the Glo and other devices with an internal SD card. If they aren't booting, then something else is going on.
The absolute simplest is that the battery is flat. Charge it. No matter what the state was when it was last working, you should assume it is now flat. Though, I think the power LEDs are flashing for to long for this to be the issue.
The next simplest is that you didn't put the card back in properly. Or unplugged the cable to the screen.
The next is that you didn't write the image properly. I'd suggest trying again, but not resizing the book partition. That can be done after the device is running again. And trying another card is a good idea. It might be a failing card that caused the original problem.
The last possibility is that the screen has been broken. You can usually see this as lines across the screen. But, sometimes they aren't obvious because of what is on the screen. Or it is at the edge and not visible. There are photos posted in the forum of what this looks like. And it more obvious if you look at the back of the screen.
One comment on your factory reset: The device has to be off. It probably was, but, when I have posted the instructions in the past, the first step is always to hold the power switch in the off position for 20 seconds to make sure it is off.
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