Upgrade iPhone 12 64GB Storage to 256GB

Step 1

Upgrade iPhone 12 64GB Storage to 256GB

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• The capacity of this iPhone is 64GB.
• Remove the display, Disconnect the battery, and Remove the motherboard.

Step 2

Repair step

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• Attach the motherboard to the holder and then attach the high-temperature tape.
• Heat the side of the NAND with Hot Air Gun at 280℃ and airflow 45.

Step 3

Repair step

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• Remove black adhesive on the side of the NAND with a Side Glue Cleaner Blade.
• Heat the NAND with Hot Air Gun at 385℃ and airflow 45. Pry up the NAND with a Pry Knife
• Apply medium temperature solder paste to the bonding pad with Soldering Iron at 365℃.

Step 4

Repair step

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• Apply a small amount of Paste Flux.
• Remove tin on the bonding pad with Soldering Iron and Solder Wick.
• Clean the bonding pad with PCB Cleaner.

Step 5

Repair step

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• 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.

Step 6

Repair step

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• Apply some Paste Flux to the bonding pad and put an iPhone 12 256G NAND in position.
• Solder the NAND with Hot Air Gun at 365℃ and airflow 45.

Step 7

Repair step

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• 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.
• Activate the phone on 3uTools.

Step 8

Repair step

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• Set up the phone and WiFi can be searched normally.
• Go to Settings > About. The phone has a 256G capacity.
• The serial number, WiFi address, and Bluetooth address remain unchanged.