Samsung galaxy tab a custom os download?

[EmersonTheTiny]

what is it and what does it to and how can i get to the boot menu of my tablet samsung tab a sm t350 version 5.02 lilopop

 

[webworkings]

It sounds like you are talking about changing the OS on the phone? Rooting the phone perhaps? In this I could not help you. However, although the forum is geared towards phones, I do believe the "Rooting, Jailbreaking & Unlocking" Forum may have people who could assist you better. http://www.tomsguide.com/forum/forum-117.html