Obdii365.com here will show how to copy a spare smart to the Kia K3 2025-2026 usingCGDI K2 key tool.

Keep device up-to-date to use therecently updatedNCF29Ax smart key copy function. The procedure goes to other NXP NCF29Ax smart key types.

Procedure:

Read original key information.

Chip type: 4A

MCU chip: NCF29AxID: 480288E9

Locked status: Locked

Read new key information (must copy new original key). This is a new key to be programmed so the ID is FFxxxxxx.

Remove the original and new key shell.
Solder wires to the original key and new key circuit board via CGDI K2 renew cable. CGDI K2 will show you wiring diagram after selecting correct NCF29Ax type.

First of all, connect the original key board with CGDI K2 via renew cable.

Go to MCU Programmer function.

Select MCU chip type: NCF29A7-locked.

Read Chip Data.

Read and save original key data.

Disconnect the original key board with CGDI K2.

Connect the new key circuit board with K2 via renew cable.

SelectWrite Chip Data.

Select the original key file we just saved.

CGDI K2will ask if need to modify key ID.

We modify key ID to match the original key.

Write chip data successfully.

Copy new smart key successfully.

Read new key information. Now it shares the same ID with original key.

Desolder wires from both keys, install key shell. Then test remote control function.

It’s done. Saving money from buying pin code and learning on car.

Some users also found that welding the wrong wire still doesn’t kill the chip.

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