Upgrade FAS2552 7MOD to CDOT

Hi all !  

I'll have to upgrade a FAS2552 which is currently running  7MOD 8.2.5P2. By checking HWU, I could upgrade to ONTAP 9.6 (even 9.7). What's the process to do so ? Data have already been migrated, so i'll first erase everything (option 4), no need of 7MTT. 

Thanks for your answers. 

Regards.