first tell us if you are rooted, unlocked bootloader, if not thats what youll need to do first.
once that is done, then go on and flash a custom rom.
only stable ones are jelly bean 4.1.2 roms, 4.4 are good too but not wholly optimized.
Also would like to point out (I just found out this) is that you can not use a third party app to stop texts from showing from certain numbers. I believe this is on all of 4.4 though
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