That last requirement:
Quote:
* Downgrading to 5.4.3 and KEEPING the old FW is not an option. I noticed that the latest FW is considerably faster so I would really want to keep the new FW if possible and not run on the old one.
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is a show stopper.
The 5.4.x series are each complete images, the "downgrade" (or "upgrade") changes the complete image - there is no option for doing both (an image change and keeping another image).
Everything else mentioned can be dealt with here otherwise.