Default [Q] Galaxy Tab 3 Mini is detected as EMEI by PC

Hey, guys. I need some help with the problem with fixing my tablet. After I screwed up with installing a custom recovery, the tablet doesn't turn on anymore. It also doesn't react to the combinations like home+power+volume down/up. PC detects it as EMEI and I can't do anything with it, Kies just doesn't see the tablet. What should I do? Thanks in advance!