: You'll need the admin password. The default is usually admin for both the username and password, but this may vary.
: Before updating, it's a good idea to check the current firmware version of your phone. You can do this by navigating to the phone's menu, then to Status or Settings > Status , and look for the firmware version. yealink t53w firmware upd
Maintaining your Yealink T53W Go to product viewer dialog for this item. : You'll need the admin password