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Tip:
Sometimes, if you are OK with a little rasing of the floor , you may lay a new tile over old tile. Just clean old tile well, scrach it using a grinder and add cement addhesive(sold in hardware...

4.You could tile the backerboard on the ground and then lift the whole backerboard up with the tiles on it and screw to the studs in the joint space between tiles(if joint space can fit screw head...