it should be safe. From what I know the update only broke it as it was updating so installing a dual-boot after should be fine. You might want to test first so just install something small like mint for a test and see if it works.
I use a USB cable with file transfer. I also do phone file management like this because it's easier
tie him to a chair and make him watch this
https://yewtu.be/watch?v=MBBOjf7fLrc
(I'm joking about tiying him to a chair ofcorse)
@Dr_01000111
@lemmy.blahaj.zone