Before changing your device, please make sure to turn off your 2FA code and turn on the 2FA code again on your new device. You can follow the turn on/turn off 2FA code procedure here: https://support.bitcastle.io/hc/en-us/articles/14181979409305-How-to-turn-on-turn-off-2FA-code
If you have saved the 16-digit recovery code during the2FA verification setup, you can restore the settings when you change devices: https://support.bitcastle.io/hc/en-us/articles/14182003994393-I-would-like-to-reset-2FA-code-and-I-have-saved-my-16-digit-set-up-key
If you have not saved the 16-digit code, please reset 2FA following this procedure: https://support.bitcastle.io/hc/en-us/articles/14182104383001-I-have-not-saved-the-16-digit-key-and-I-would-like-to-reset-2FA-code
If you have further inquiries, please don't hesitate to contact our Support Team via "Contact Us" function.