Factory images for Android 4.0.4 (IMM76I) have been made available for yakju variants of the GSM Galaxy Nexus, as well as a newcomer — the takju build. (androidcentral.com)
The list includes GSM capable Nexus S (soju or sojua versions) and Galaxy Nexus variants (takju and yakju versions), as well as Nexus 7 (nakasi version). (gadgetian.com)
These were all the steps that you had to take in order to successfully upgrade your Galaxy Nexus I9250 takju / yakju firmware version. (android.gs)