Just wondering if the image can be upgraded directly from 7.0.x to 7.4.2c directly if willing to do a disruptive upgrade, or if a specific path needs to be followed. 7.0---7.1---7.2 (from 7.2 it looks like no issue going to 7.4).
You'll have to look at each of the Release Notes to determine your upgrade path.
I'd start by looking at the 7.2 as you should be able to jump from 7.0 to 7.2 disruptively, then 7.2 to 7.4.
v7.0.x ===> v7.1.xv7.1.x ===> v7.2.xv7.2.x ===> v7.3.xv7.3.x ===> v7.4.2c
v7.0.X ===> v7.2.x (Disruptively)v7.2.x ===> v7.3.x (Non-Disruptively)v7.3.x ===> v7.4.x (Non-Disruptively)
v7.2.x ===> v7.4.2c is not supported
For more detailed please read the release notes attached