This video is about how to increase the internal storage (memory)of iPhone6 16GB to 128GB by changing HDD (flash chip) . This is iPhone6 16gb and i am converting it into 128gb by replacing HDD (flash chip)you need a new HDD (flash chip) and the serial number reprogramming tool(WL 64bit serial number changer ) Has you know the serial number is programmed in HDD (flash chip)so we need to reprogram the old serial number in new HDD (flash chip)after replacing the HDD (flash chip)we need to restore the phone because the new HDD (flash chip)is empty it doesn't have IOS .so connect to iTunes and restore it. then it turn into 128 gb
NOTE: In this process phone will lose it's data. so it's better to take back up before you replace HDD (flash chip) it may have high possibility of brick your phone.this work should done only professional technicians.