External sd card won't mount

Hello everyone, I'm new here. This is my first time posting so I don't really know if I'm posting at the right place.

Anyway, I don't know how to start but I rooted my LG optimus G pro and everything was fine. I wanted to install a custom recovery and I downloaded this apk called G pro recovery. I installed it and everything was okay but as soon as I rebooted my phone, it took time to start but it did come on.

The apk did not work and no recovery was installed but after that my SD card...

External sd card won't mount

from Android Authority Forums http://ift.tt/1Wbm726
via IFTTT