You need the right wbf file in the boot partition named as default.wbf. I know of at least 3or 4 different types of touchscreens used on the 626 model line. It must correspondend to infos written on your screen ribbon cable.
320_G110_AA9224_ED060XD4U2_TC.wbf
default.wbf
V220_C189_WR7801_ED060XC3C1_TC.wbf
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