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Why you can't wipe your mac os hard drive
https://support.apple.com/en-gb/HT204904
When you are replacing more than one stick of RAM
When you are replacing more than one stick of RAM, the computer will often struggle to register such a significant jump in size resulting in beeps and a failure to boot. If you experience this, shut the computer down and install just one stick, ...
How to find your Boot ROM version
1. Find your Boot ROM version using one of these two methods: a. If you have an old working SSD on hand, boot up your computer. You can locate the Boot ROM version number by clicking the Apple icon -> “About this Mac” -> “System Report”. It ...