Re-root after security patch on S7 G-930 - Need help :)

Hi guys, in the last days I had lost my root after the annoying security patch that have affected many of us.

Re-rooting with CF Auto Root seems to be ineffective for devices that have lost the stock boot image backup, as explained by Chainfire here: http://ift.tt/20cXyn8

Quote:

In theory, fixing root is as simple as flashing the new SuperSU v2.74 BETA ZIP file in TWRP, or using the updated CF-Auto-Root for your device. In practice, this will not work for a fair share of users. To re-systemless-root using SuperSU ZIP's or CF-Auto-Root, if you have already been rooted, requires the stock boot image to be restored. Both methods create a backup of the stock boot image before applying root. During testing of this fix however, it became clear that a lot more users than I had expected managed to somehow lose this backup (clearing cache, factory reset, etc). If this backup is no longer on your device, neither flashing the SuperSU ZIP nor re-applying CF-Auto-Root will fix the issue, as both installations will fail.

There is a solution here but before that I want to be sure that the stock boot image isn't on my device.

I have only carried two factory reset before rooting with CF Auto Root and never after so in theory I still have the backup of the stock boot image maked from CF Auto Root during my first root on my phone, is that correct or have I misunderstood?
Can I use the latest CF Auto Root (BETA-SuperSU-v2.74) with Odin like in my first root in order to try that or I could have problems?

Thank you very much for your help, I'm pretty new in the Android world and my english is not so good...

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