Port of the PS2 Homebrew tool esr-disc-patcher-cli. Based on Tatsh's original work posted on PSX-Scene.
MIT Licensed to fit with similar software. Also note notice in other ESR patching tools below.
ESRPATCH v0.24 - PS2 ISO patcher for ffgriever's ESR project
By: bootsector - http://www.brunofreitas.com/