Firmware upgrade matrix

[hollow lintel]

Hi team.

Customer wants to upgrade to 11.70.4R1P1.
and now using 11.20 and 11.30 etc... things.

i'm trying to find upgrade matrix document, but i can't find it.

where can i check upgrade matrix? (i mean upgrade path)

Plaese Let me know!

[young cloud]

This KB article is prob a good place to start: https://kb.netapp.com/onprem/E-Series/Hardware/What_are_the_best_practices_for_upgrading_E-Series_Controller_Firmware_06_xx_07_xx_and_08_xx

What model E-Series?