if [ -n "$fw_mtd" ] && [ ${fw_blocks:-0} -gt 0 ]; then
local append=""
- [ -f "$CONF_TAR" -a "$UPGRADE_OPT_UPGRADE_OPT_SAVE_CONFIG" -eq 1 ] && append="-j $CONF_TAR"
+ [ -f "$CONF_TAR" -a "$UPGRADE_OPT_SAVE_CONFIG" -eq 1 ] && append="-j $CONF_TAR"
sync
dd if="$fw_file" bs=64k skip=1 count=$fw_blocks 2>/dev/null | \