Normal Flash” button doesn’t wipe data, and the “CSE Flash” button wipes data. Once you’ve selected LG Velvet 5G UW LMG900VM firmware.kdz, click the CSE Flash button to proceed on flashing the.KDZ firmware to your LG device.ħ. Leave every other option as is on the LG Flash Tool window.Ħ. Click the browse button at the end of the “Select LG Velvet 5G UW LMG900VM firmware.kdz file” line.