My s4 is stuck on samsung logo...how do I get it off that?

[AC Question]

My samsung galaxy s4 I'd stuck on samsung logo when 8 turn it on...it won't go past this..what do I do yo get it to go further? I turned the phone off when I got the s5 and am giving the s4 to my son..
but was told I needed to get it flashed...what is that and can I do it myself?

 

[B. Diddy]

Welcome to Android Central! Try booting into Recovery and wiping the system cache: http://support.t-mobile.com/docs/DOC-5744