Upgrade iPhone 12 64GB Storage to 256GB - The Easiest Ever?

Blake Mar 09, 2021

From the first iPhone to iPhone 11, Apple has stored serial number, WiFi address, and Bluetooth address on NAND. However, REWA technicians recently discovered that the NAND on iPhone 12 does not store serial number, WiFi address, and Bluetooth address, which means that the NAND of iPhone 12 can directly be replaced by an iPhone 12 NAND and activated. Therefore, REWA technicians speculate that the storage upgrade of the iPhone 12 will be easier than previous models. Read this article to verify our speculation! The iPhone 12 serial number, WiFi address, and Bluetooth address are said to no longer be stored on the NAND. So the replacement of NAND no longer needs the NAND programmer.

The capacity of the iPhone is 64G.


iPhone 12 storage

Disconnect the battery. Remove the display and the motherboard.


iPhone 12 teardown

Attach the motherboard to the holder and then attach the high-temperature tape.
Upgrade iPhone 12 64GB Storage to 256GB

Heat the side of the NAND with Hot Air Gun at 280℃ and airflow 45. Remove black adhesive on the side of the NAND with a Side Glue Cleaner Blade.
iPhone 12 NAND

Heat the NAND with Hot Air Gun at 385℃ and airflow 45. Pry up the NAND with a Pry Knife
iPhone 12 NAND replacement

Apply medium temperature solder paste to the bonding pad with Soldering Iron at 365℃ and then apply a small amount of Paste Flux.
Upgrade iPhone 12 64GB Storage to 256GB

Remove tin on the bonding pad with Soldering Iron and Solder Wick. Clean the bonding pad with PCB Cleaner.
Upgrade iPhone 12 64GB Storage to 256GB

Heat the bonding pad with Hot Air Gun at 280℃ to remove the black adhesive. Dip rosin with Soldering Iron and Solder Wick to remove tin on the bonding pad. Clean the bonding pad with PCB Cleaner afterward.

 
Upgrade iPhone 12 64GB Storage to 256GB

Apply some Paste Flux to the bonding pad and put an iPhone 12 256G NAND in position.
Upgrade iPhone 12 64GB Storage to 256GB

Solder the NAND with Hot Air Gun at 365℃ and airflow 45. After the motherboard has cooled, peel off the tape.
Upgrade iPhone 12 64GB Storage to 256GB

Install the motherboard and display. Plug in the data cable and connect the iPhone to the computer. Open 3uTools to flash the iPhone. The phone does not display a progress bar during the flash process and won't display a progress bar until the flash has finished.


3uTools to flash iPhone 12

Activate the phone on 3uTools. Set up the phone and WiFi can be searched normally.
Upgrade iPhone 12 64GB Storage to 256GB

Go to Settings > About. The phone has a 256G capacity. The serial number, WiFi address, and Bluetooth address remain unchanged.
Upgrade iPhone 12 64GB Storage to 256GB
Upgrade iPhone 12 64GB Storage to 256GB

It can be confirmed that the serial number, WiFi address, and Bluetooth address are no longer stored on the NAND. Replacing the NAND of iPhone 12 with a disassembled iPhone 12 NAND no longer needs a programmer to write the serial number, WiFi address, and Bluetooth address. Unlike previous models, the NAND of iPhone 12 can be directly replaced. REWA technicians speculate that the serial number, WiFi address, and Bluetooth address are likely stored on EPROM or CPU. The technological change that Apple has made does make storage upgrade easier. But REWA doesn't recommend that users upgrade storage on their own. The first reason is that Apple does not provide a warranty for the phone that has been disassembled before. The second reason is that inappropriate operation may lead to some malfunctions. The water resistance function will be much worse. But for a phone with a bad NAND, it will be much easier to repair.

For more storage upgrade content, please read the articles below.

Upgrade iPhone X 64GB Storage To 256GB in 5 Steps With iREPAIR DFU Box

iPhone 6s Memory Upgrade From 16GB to 128GB

Watch the video below to see how we upgrade the storage of the iPhone 12.




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