UCS file migration on differing OS versions

Hello, 

Since the new rSeries isn't in production yet, so you can try, so : 

First: 
in your Upgrade path, avoid upgrading to v16 it's not supported over F5OS platforms, so use V15 
so it shoud be ( V12 --> V14 --> V15 --> V17.1.x ) 

Second: 
you need to request these series of Old versions from F5 Support, so contac t them if you have a valid Contract. 

Third: If you couldn't get them you will do some work manually.... 
- get bigip.conf file from the old devies, and ( bigip_base.conf  if you want to migrate with the same L2 configs like Vlans , Trunks , selfips ) 
- open the new TMOS tenant that inside the rSeries and then merge configurations from terminal, use this article 

https://my.f5.com/manage/s/article/K81271448#:~:text=save%20/sys%20config-,Merging%20a%20BIG%2DIP%20configuration%20from%20the%20terminal%20into%20the%20running%20configuration,-To%20load%20the

- When you encounter errors duo to missing some dependances in some Configuration objecs like Virtual servers, go and add them manully via GUI, Like downloading ( SSL Certificates and Private Keys ) make sure to put them before anything on the new tenant. 

- then start with mergind ( Nodes, Monitors, irules , Profiles , pools , VIPs .... )

- Avoid restoring UCS file on V17 directly. 

- As I see you don't need GTM configs anymore, so don't merge or add anything from bigip_gtm.conf 

Good luck !