Updating Benz Smart Key 3 button W/O Chip (433mhz)

Updating Benz Smart Key 3 button  W/O Chip (315mhz or 433mhz)
you can let your old benz smart key update to the new onle if you have our this style product .
 
The process you can see the below picture:
1.change the AMS chip to the board from old original board.
2. change the NEC chip to the board from old original board.
3.change the winding.

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