1. Download and upgrade from token.im
2. Do not use mobile device after Root
3. Do not deeply clear up your mobile device as some important files may be deleted in your Android device.
1. Download and upgrade from APPStore
2. Do not use apple ID provided by third party, for example bought from Alibaba
3. Do not use iCloud to backup. Because it maybe uploaded to iCloud if you backup in wrong way like screenshot mnemonic or store private key in note