My questions are:
Are these roms compatible with my S4? (The current baseband is M919UVUAMDL, and build number is JDQ39.M919UVUAMDL)
What's the best way to install these custom roms?
Will I lose anything by upgrading (I've seen some posts about Knox-enabled bootloader, plus from experience with Apple iDevices, once you upgrade it's hard/impossible to go back)
Do I have to root first?
Is there a tutorial I can follow?
Thanks so much in advance for your help.