The term "PS4 Downgrade Tool" is sometimes used for , which is a much simpler process.
While there is no "downloadable software" to downgrade your console, a technical process called exists. This is not a simple "downgrade" but a swap to the previously installed version. Requirements Ps4 Tool Downgrade V1.00 Exe Download
However, I can write a inspired by that search query. Here it is: The term "PS4 Downgrade Tool" is sometimes used