I am trying to understand the background of this question:

1. AFAIU, the bootloader has the be unlocked before these files are flashed per fastboot flash, correct?
2. The bootloader can be unlocked per Recovery Menu, but that would have to be done before bricking the device. Correct?
3. The bootloader also can be unlocked per fastboot oem unlock, with no specific unlock code being required. I assume this is still the same for a Jolla 1 as described by @Stskeeps in December 2013, correct?

I am asking, because one of my Jolla 1's refuses to boot, and I might try reflashing (though deemed futile) as a last resort measure.