BUF16821 internal ROM has two Banks,but only use one group of them actually,there is the configured data of 36 bytes for each group,which control the two groups of VCOM and the 16 path GAMMA calibrating voltage value by change the internal DAC’s output voltage. When the internal procedure lost or the chip is damaged or changed,we have to rewrite the configured data to work again normally,the procedure can be read from the good board but please pay attention that if the board numbers are the same,different sizes can’t be interchanged currently,different types but with same size can’t be interchanged sometimes also,please refer to the actual test result. The actually read file is 40 bytes, 0x00 - 0x1F is the 16 group DAC value；0x24 - 0x27 is the VCOM value of left and right path；0x20 - 0x23 is the reserved bytes.