Other functions of the phone are normal, but text messages cannot be sent. Is it related to the upgrade?

Contact customer service to re-upgrade the software. Upgrading the software is free.

As for the fact that you cannot send text messages, it may be that the SMS message center number is set incorrectly, and it does not necessarily need to be upgraded.

But it has been upgraded and a problem occurs. It must be caused by the software upgrade. It is most likely caused by the incorrect software version and the configuration of the mobile phone's FLASH. Just go to customer service and download a correct version again.

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Is the person you are looking for to repair your mobile phone from Amoi’s customer service staff? I don’t think so, otherwise they will handle any problems with your mobile phone.

You can go to your local Amoi after-sales service station for repair, and they will definitely accept it. For the specific address, you can check Amoi's website online, or you can call their 800 toll-free number to inquire. Good luck.