I doubt it was a real wallet - most likely it was just a scam exchange that would prompt you to send cryptocurrency “for verification” before you could try to withdraw them.
The idea was already exploited on prnt.sc, where it is possible to try bruteforce screenshot ID and find other users public screenshots - https://splashdot.github.io/scam1/
If I remember correctly, the Chinese version is the same thing as the later global release and it should not be necessary to flash a ROM, it should contain English right out of the box and more feature will come later with update over zepp life/whatever the app is called now