手动修改lef后，保存的设计打不开了，报错ERROR: (IMPIMEX-7024)，如下：
**ERROR: (IMPIMEX-7024): The file xxx/save_4_2_ocv.enc.dat/libs/lef/xxx_rvt.lef inside the saved design directory was modified. It is forbidden to load the modified design when binary constraints enabled. This is dangerous and can cause unexpected problems and crashes when reading the design or inside commands later in the flow. If you are just experimenting and/or debugging and accept the risks, you can set the Tcl global restore_db_file_check to 0 and try again.
解决方法就是报错信息中的先把restore_db_file_check设为0。
