Forum Discussion

mtfeliciano's avatar
mtfeliciano
Icon for Altostratus rankAltostratus
Jun 24, 2026

UCS file migration on differing OS versions

We are currently upgrading the F5 load balancers of our customer, from iSeries, to rSeries.   old F5 load balancers: model: BIG-IP i5600 (C119) OS: 12.1.x (either 12.1.2 Hotfix HF2 2.0.276 or 12...
GTM DNS
ucs
Daniel_Wolf's avatar
Daniel_Wolf
Icon for MVP rankMVP
Jun 25, 2026

Hi mtfeliciano​,

  1. The fact that your customer is still on 12.x should tell you, that they didn't care about their BIG-IP for more than 8 years. Ticking bomb...
    Your update sequence is correct.
  2. Try your luck opening a support case. I doubt a customer running on 12.x has an active support contract...
  3. Make sure you have the Masterkey: https://my.f5.com/manage/s/article/K000152853
    and that you prepare the UCS archive for migration from iSeries for rSeries: https://my.f5.com/manage/s/article/K000160543
  4. Remove the GTM config on the iSeries before the migration.

Good luck

Daniel_Wolf's avatar
Daniel_Wolf
Icon for MVP rankMVP
Jun 25, 2026

And for 3.
Don't take an UCS on 12 and restore it on 17. Just don't!