If you want to replace the key case or jey fob from a Peugeot 207, 307, etc. you have to follow just 9 simple steps.
- A nail
- A hammer
STEP 1: open the key fob to have acces at the inside pin and hit the nail with a hammer until you see the pin comes off
STEP 2: do the same with the new key fob
STEP 3: replace the blade for the new key and put the pin back
STEP 4: open the key fob with the blade of the other key
STEP 5: remove the electronic part from the old key case
STEP 6: open the new key case
STEP 7: move the electronic part and the battery to the new key case
STEP 8: put your new key fob back together
STEP 9: stick the new logo on the new key case.
See also these VIDEO TUTORIALS for VW Golf Mk4: