Please press reovery button to check your old dl400 pro tester system version and memory, if 4gb, need replace expand memory ic to 32gb, then upgrade new system 20230923, then tester will support test 13 pro,13 pro max,14 pro, 14 pro max lcd display. before replace memory ic, please confirm with your supplier whelther your tester can upgrade with this way, some old dl400 tester must return to factory to upgrade,