Tuesday 21 January, 2020 |

Change iPhone 11 Pro Max to dual SIM card and upgrade Nand flash

Here is an iPhone 11 Pro Max need to be remodeled，this iPhone 11 Pro Max is single SIM version, and the iPhone Nand flash is 64GB, we need to change the iPhone 11 Pro Max to dual SIM version, and upgrade the iPhone Nand flash memory storage.

First of all, we need to disassemble the iPhone 11 Pro Max. Use screwdrivers and CPB screen separator to disassemble the iPhone 11 Pro Max, remove the iPhone display assembly, disconnect the battery, and then take off the iPhone 11 Pro Max motherboard.

Separating the iPhone 11 Pro Max motherboard. Put the iPhone 11 Pro Max motherboard on the Mechanic IX5 MAX heating platform to separate the motherboard layers. After heating for a while, take off the iPhone 11 Pro Max motherboard upper layer. 



Remove E-RIM IC by hot air gun and tweezers, apply some low temperature tin to the pins of the SIM card slot, use hot air gun to heat it, remove the SIM card slot with tweezers, and then install a new iPhone 11 Pro Max dual SIM card slot.

Next we need to change the SIM card circuit. Use hot air gun and tweezers to remove the E-SIM IC, there is a resistor under the baseband, which is not available for a single SIM version， we don't need to install this resistor, we just need to solder a jump wire to short connect it. Use a soldering iron to short connect it. When it's done, it's a dual SIM card version.

Now we need to upgrade the iPhone Nand flash. Attach the iPhone 11 Pro Max motherboard to the PCB holder fixture, use BGA removal blade to remove the black glue for the nand flash, and then apply some solder paste to the iPhone Nand flash, use hot air gun and BGA removal blade to remove the iPhone Nand flash.



Apply some solder paste to the iPhone Nand flash solder pad to remove the black glue on the solder pad, and use clean it with the brush.

Now use the DC power supply to measure the boot current for the motherboard to test if it's normal. The current measured is normal, which means the iPhone motherboard components and circuits are normal.

Use JC P11 programmer to program the original underlying data to the new iPhone nand flash, apply some solder paste to the solder pad, and then install a new iPhone Nand flash to the motherboard.



Now assemble the iPhone 11 Pro Max motherboard, and then install the iPhone 11 Pro Max. Turn on the iPhone 11 Pro Max, the dual SIM card version works well, and the iPhone memory storage has been upgraded successfully. Test other functions, all works normally.



This video was shared by G-LON.

by Bellin

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