Is your bootloader unlocked? If so, use a text editor to view the flash-all.bat file and remove "-w" from the fastboot update command. For example, if the line reads fastboot -w update image-razor-jss15q.zip, it should now read fastboot update image-razor-jss15q.zip. The -w option instructs fastboot to wipe data.
If your bootloader is locked, there is no way around it. Your data will be wiped.