Help me on how to install a performance chip.
 

My computer has 2 boards on it and they are facing eachother. Everything seems easy unitl I reached a point where I have to slide the top unit out. If anyone installed a chip in this BMW, please let me know how to sllide out the top board, I can see the orginal chip underneth, where I need to replace it with the new chip. Iam just one step away from getting this board open. Any tips is appreicated. The top board looks like it is plug in to something, I tried pulling gently but it does not even budge, So if you know of a way to get this top board apart so I can get to the chip. Let me know please thanks.