It's a linux system so there is a filesystem there, and maybe the password is located in the filesystem and not in a separate NVRAM or SPI Flash, and maybe the password is even saved in cleartext.
That's a lot of maybes, though.
I filtered out all the textstrings out of the dump-file that are at least 8 readable characters long, and filtered that to strings that only contain the following characters: A-Z a-z 0-9 ! . -
Then I sorted that and removed any duplicates.
The result is 292 lines, and that's reasonable to look through:
One line that sticks out as a typically human-sourced term is this: topsofia
It appears to be the name of some instagram account: https://www.google.com/search?q=topsofia
Perhaps it's a username on the device, but if not, maybe it's a password?
However, if by "bios" you mean a bootstrap-environment on the device, then you wouldn't find a password to that on the operating system's filesystem, because the operating system is not loaded yet when the bootstrap executes.
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