Update BoardConfig.mk

BoardConfig.mk

@@ -92,6 +92,7 @@ TW_THEME := portrait_hdpi
 TW_EXTRA_LANGUAGES := true
 TW_INPUT_BLACKLIST := "hbtp_vm"
 TW_BRIGHTNESS_PATH := "/sys/class/backlight/panel0-backlight/brightness"
+TW_MAX_BRIGHTNESS := 255
 TW_SCREEN_BLANK_ON_BOOT := true
 TW_HAS_DOWNLOAD_MODE := true
 TW_EXCLUDE_DEFAULT_USB_INIT := true