Originally Posted by Bazooka Tooth
I think the rom I used was SGS2_XX_OXA_LPH-v5.2-CWM5
That's not a ROM, it looks like a kernel.
THose instructions are for a completely different model of phone, the Skyrocket and T989, and are not compatible with the GT-i9100.
1. Restore your nandroid backup, assuming you have one.
2. Reflash your ROM again.
Not a good idea to tinker with the efs file as a rule.