: A common software versioning tag indicating it is the third version of a release candidate before the final build.
The keyword refers to a highly specific legacy toolset used in the early 2010s for the iOS jailbreaking community. Specifically, it points to iREB RC3 , a utility developed by the well-known hacker iH8sn0w to help users bypass iTunes errors (like Error 1600, 1601, or 1604) when installing custom firmware on older Apple devices. ireb+40x+41+421+rc3zip+extra+quality