Help to change the sql version

Hello, I realized my website on flywheel and I wanted to transfer it online.

But my host tell me my database has to be in version 5.5 and I created my website in 5.6… I didn’t kwow how to change that, if it is possible.

My host gave me a process to solve the problem with myphpadmin (customized export of the database in 5.5- select mysql40) but I don’t know if it is possible with adminer ?

Thanks for your help, I hope I have not to do a new website because of this mistake…