My samsung galaxy a3 (sm-a300fu) doesn't bot ?!

[Armand Beadini]

Hello guys , I bought my Samsung Galaxy A3 (sm-a300fu) about 6 or 5 months ago and yesterday i tryed to change my room to android 5.0.2 official ... It worked sucesfully and i rebooted it multiple times there was all ok but i rebooted it about 1 hour ago and when it booted it shows only small red , blue and white dots !! And it becomes hotter and hotter !!

Please help me and sorry for my bad english

 

[Armand Beadini]

It shows me this :/