@liyiecho: So you did recently apply the hotfix (when you updated to 5.7.2.1)?
And, to be perfectly clear, because timing is key here, you basically did, in that *exact* order, and without any extra factory reset in between:
* Initial JB way back when
* Update to 5.7.2.1
* Hotfix
* Update to 5.7.3
* Factory Reset
Because, as @knc1 mentioned, a factory reset *then* an official update is unrecoverable.
An official update *then* a factory reset, on the other hand, would have been a terrible idea, but shouldn't have prevented the hotfix from being successfully applied...
So, yeah, we really need you to be *precise*

.