How to Upgrade to First Class on Emirates? - 1

When you are upgrading your dragon 14 to 15 then sometimes you may be face an Troubleshoot invalid acoustic error. If you are

facing the same issues, then you can go through with this article. This content will help you quickly to short out your error.

Here in this post, you will find the simple steps for resolving the issues of invalid acoustic errors after uploading dragon 14

to 15.

Done