Dear sheikhshahid,If you reset your phone you cannot decrypts your SD card. Suppose you guess that you have J7 and you encrypt your SD Card ..at that time your friend have also owned J7 so your friend can encrypts it easily.so if you reset your phon...

Hi,this is not a big issue..you can insert your SD card to your previous phone(where you had inserted before) and decrypt from there.and your SD card working fine without loosing any data.