I also recently bricked my Libra 2 (it also had a blank screen with a blinking light). After trying several methods, I was able to bring it back to life.
1. Hold the power button for 30 (I don't remember exactly how many) seconds
2. Put it on charge for a while. It took me about an hour to charge it, but on the forums it was advised to charge it for up to a day.
3. First, I held down the page turn button, then the power button, and then clicked randomly all over the bottom edge of the screen (taking into account that Libra was in the right-handed position). Given that both hands were already occupied with their own buttons, and there was no one around, I had to click on the screen with my nose (I felt like a complete idiot), but it worked, and I avoided replacing the microSD.
Maybe these steps will help you too.
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