Re: System Upgrade to High Sierra - firmware update backwards compatible to Mavericks
The firmware update won't interfere with being able to dual-boot. Let me understand: your machine currently is flashed to act as a 5.1 right? You do know that going to High Sierra will also change the formatting on any internal ssd's to APFS.
Until a couple of weeks ago I ran a dual-boot on the same ssd: one partition for Mavericks and one for High Sierra. Before I went to HS that partition was Sierra. When I went to HS I installed it onto the Sierra partition and that was the only partition that changed to APFS formatting. The other partition stayed the old Mac format. So your Mavericks ssd shouldn't be affected. If you're really worried about things pull the Mavericks ssd before going to HS on the Sierra drive.
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