Samsung Galaxy S4 firmware update that I got via OTA around 26 Dec 2013 and it has changed the build number for my Galaxy S4 I9500 from 19500XXUEMJ9 to 19500XXUEMK9 the OTA update size was 114 MB and Samsung terms it as a Stability update.
Update your Galaxy S4 via Kies software http://www.youtube.com/watch?v=inv0Idt8tcU
All of my other videos on the Samsung Galaxy S4 http://www.youtube.com/playlist?list=PLtIc4giS3RKO0i6xuCteOk9fcG99u_d-i
