How to install a linux distro on an old tablet

Dear friends,
I would like your help with the following matter:
I bought an old tablet, an SPC FLow 7 with AArch64 processor rev 4, 1 GB RAM and 8GB Flash RAM with Android 7.
I’ve read several articles on the net about whether it’s possible to install a Linux distro on the tablet and I’m a bit confused, so I’m asking for your help. There are articles that say it’s possible without root, but what I’m interested in is completely replacing the operating system that’s installed on the tablet with another.
I’ve already installed adb on my PC, I can access android, but I can’t go any further than that.
Do any of you know how to do this installation?
Do you know of any lightweight distro that I can install?

Thank you in advance for your help

Jorge

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