Discovered something of interest slightly. Turns out that using a dash, or not using a dash, tends to make a big difference. To make things simple, I will include a list of what happens whenever I enter in a certain command using Bluestacks Nougat 64-bit as an example.
adb backup full: 1KB file
adb backup -full: Backup screen won't appear
adb backup all: 1KB file
adb backup -all: 39KB file
While the fourth example will vary up to 49KB depending on the firmware, I'm sure there is a running motif here...the backup keeps failing...it needs to be several MB in size. What can I do to make it work, so I can extract the android key? Also, for those who are wondering why I don't just try entering "adb backup com.amazon.kindle" it's because it fails no matter what version of the firmware I am using...even if I'm using an actual android phone. >_>
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