safe steps to downgrade from mm to lolipop 511 note4 910c

hello guys my phone note 4 910c is new and came with android 511 directly and i flashed custom 511 rom and want to try also custom mm rom but if i want to return to lolipop from mm what are the safe things and best steps to do it to avoid lost imei and signal and other issue ...and at first can i return to lp from mm ...thx in advance and sorry if asked before but my phone still new and dont want to brick it

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