How can I upgrade to SAFe 5.1?

If you are an SPC or SPCT, you can upgrade your SAFe 4.6 or SAFe 5.0 certification at Scaled Agile Community.

There is an upgrade with no extra cost, and you have 2 exam retakes.

https://support.scaledagile.com/s/article/FAQ-What-is-the-path-for-SPCs-and-SPCTs-to-upgrade-from-4-0-4-5-or-4-6-to-5-0