Swap external sd card with external

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http://androidforums.com – Hello, I recently rooted my Huawei Premia M931 and I have been going through different articles how to swap external sd card with internal. I understand I need to switch some values in vold.fstab but I cannot figure it out... Can someone please help me I will greatly appreciate it, I am running the stock ICS 4.0.4 since there is no roms. (General)