Lonsdor K518 PRO can program a smart key for the 2024 Volvo XC40 on the bench. The procedure is applied to key adding & all keys lost. Now I have 2 keys: a new key and the original key. Let's start to do step by step.

We need to disassemble the CEM and read the data inside.
Follow the operation to connect the CEM module. It's under the steering wheel. Take the box off, it only has 3 ports on it.

We've got the board from the dismantled CEM module.
Solder the wire and then connect to KPROG's Adapter.

Since we haven't updated the XC40 menu of the K518 PRO device, the XC40 program is unavailable for the 2024 model. But the XC60 program works
(Sometimes switching XC40 and XC60 program will work)

Immo & Remote >> VOLVO >> XC60 >> 2022- >> Program smart key >> Operation instruction
Match the board and chip model to solder.
After successfully welding the cables, connect to the KPROG adapter.
Be aware that the connecting cable shouldn't be too long. And plug in the power supply.

Read CEM data >> OK >> Save data file
After saving data, we can go back to add the smart key or all key lost.

Select a method to obtain the security code >> Load CEM module data
Performing this function will delete all the programmed keys. Please prepare all the keys to be programmed.
We got all keys ready, both keys are here.
Click OK.
The current of keys: 2
All keys are currently cleared.
The current of keys: 0

Please place the programming key in the sensing area. For this car, the armrest box is the sensing area. Put the key here, click OK.

The current number of key: 1
Whether to program the next key? Yes.
Just take the first key out and put another key there, click OK.
The current of keys: 2
Program complete.

Let's check whether the key can be used normally.
Lock and unlock OK, start car OK.
Done.

www.obd2shop.co.uk