#1 Google Play Store has stopped working when trying to open it up, when trying to install an application like Snapchat or YouTube or it just crashes by itself. It is able to update applications that it is can't install, though. #2 SD card is recognised by preinstalled explorer and I'm able to use file it contains. The problem occurs when you try to download any kind of file. In case of Google Chrome there's a notification like file download failed due to missing SD Card. Preinstalled download manager gives a notification like couldn't complete the operation. #3 Screenshot function just doesn't work. There are files saves as screenshots they're 0 bytes size and contain absolutely nothing. EDIT: All these 3 issues can be fixed by using fix contexts option in TWRP. Thank you all for your help!