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Clean memory pins and the board around it, if your board has a layer of rubber or varnish, clean it with a toothbrush and Thinner. You could remove the rubber smoothly on the board using a screwdriver first.

Tin one side of the memory. Don´t be afraid ! Make a big line of tin on pins. When you add more quantity of tin you reduce to zero the risk to damage the board.

 
   
Hold the memory with an special clip (Dil extracting clip) as shown in picture. Now heat the tin side with a soldering tool, moving the soldering tool heating all pins of line. When you are sure all pins are hot (tin must be in liquid state) start to pull, continuing heating all pins.
   
When pins are free remove the soldering tool , but stay pulling with the clip till tin is solid. Now repeat “step 2” and remove the memory from the board completely.
   

Clean the board with a toothbrush and Thinner. So remove the remaining tin with a copper wick (tape tin remover) and clean it with thinner again.

   
Now we need to remove tin placed in the holes of the board. To do this use a thoothpick. Heat the hole, when tin becomes liquid pass the thoothpick through the hole.
   
When holes are free clean the board and place a DIL socket. Look the pin number one position of the socket be in the same position of the original memory !.  Now weld pin by pin the socket by the other side of the board.
   
Place the memory on the socket, looking right position.