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How can I buy daughter board can you pls help me

Hi @mateen12 , Can’t see it to well in the images from the ifixit Sony GTK-XB5 Daughterboard Replacement guide but IF your board has the following number on it somewhere - 988521202 - this is the Sony part number for the board. If you search online for Sony 988521202 you will get results for suppliers of the part.