Everything there looks safe. 
If it does not work out, you can hold or tap the left shift key at boot to bring up the Recovery Menu at grub that offers Advanced options for Zorin. From there, you can select a Different Kernel to boot from. Once booted, you can remove any kernels you do not need or want.
Which is a life-lesson... Never remove all older kernels right after installing a new one.
Thanks once again @Aravisian . What about the firmware? Is there a way to restore it if it doesn't work?
In the O.P., you mention BIOS Firmware- this is dependent on the manufacturer, not Linux (Or Windows).
If you are referring to Linux Firmware... The short answer is; You don't need to worry about it. I have never once seen new installed Linux-firmware not work.
Okay then. I trust your wisdom. Off I go... fingers crossed, lol.
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Muhahhaha... all according to plan...
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Lamo! 
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Ooookaaay... so that went horribly wrong! After doing the "bug fix" I had zero bluetooth. Rebooted as instructed and got back on the kernel from install, only now I still can't connect. I've uninstalled and reinstalled Blueman, but each time I try to pair it says, "Cannot connect - protocol not available"
Gah! Help?!!
If you restored back to the 5.11 kernel, can you run the following in terminal:
pactl unload-module module-bluetooth-discover
pactl load-module module-bluetooth-discover
Bluetooth is directly related to Pulseaudio... and you were initially having Audio problems.
Really, what you describe should not have happened... That's a weird one. But given the above relation, I wonder if it is also a clue.
Thanks for the rescue! Okay, so I ran both, and they both returned:
Connection failure: Connection refused
pa_context_connect() failed: Connection refused
But earlier, I had installed a ppa called pipewire based on an Ubuntu forum suggestion. Could that be the cause? I don't see how it could disable my bluetooth completey.
You may need to check if anything was blacklisted. I am heading out the door even as I type this so cannot take a moment to type out a lengthy post on each thing and how to- But using your Net Search should get you going or @storm or others can chime in.
Also, remove the pulse folder from ~/.config/ if it exists, then reboot and test.
Neither do I. I believe you mean you installed Pipewire, right?
Install Pulse Audio Volume Control
sudo apt install pavucontrol
Launch it with terminal command pavucontrol and check your Input, output and Configuration tabs.
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Check /etc/modprobe.d/blacklist.conf to see if the OEM kernel blacklisted any bluetooth modules.
Within /etc/modprobe.d directory, read the other file names present for any files that reference Bluetooth.
Oh my! I started to uninstall pipewire as instructed and as the terminal was running the uninstall, my computer crashed. Black screen. After a bit of messing around I can get the grub menu, but I can't get further than that. I'm just getting errors: PPM init failed (-110)
I'm trying hard to remain calm.
So, it seems this has to do with missing Nvidia drivers. I have booted through the live usb, but I have zero knowledge of where to go from here.
How do I install the missing drivers into main OS from here?
Are you able to remember clearly what you uninstalled? What the command was?
It looks as though all video drivers were uninstalled given that error.
"as instructed" - Which instructions were you following?
You remember bapping the Left Shift Key to pull up Advanced Options for Zorin? Do that on your system (Not the LiveUSB Demo) and arrow key down to "Enable Networking"
Then back up the recovery menu and arrow key down to drop to prompt
Hit enter...
Then type in:
sudo ubuntu-drivers autoinstall
If it successfully completes, continue to boot normally to test...
I've tried 3 times to get into the advanced options but pounding the shift key does nothing. It just continues to boot to the regular grub then to errors. IDK what the heck is going on. Is there another way to access the advanced menu?
I'll share the link if I can ever get back into my laptop. It was something like: sudo apt-get uninstall ppa:pipewire How in the world could this uninstall all my video drivers? Gah!
What to do now? Is there someway to access the tty screen and do it from there?
This shouldn't have done anything, really.
The proper command to remove a ppa is
sudo add-apt-repository --remove ppa(Whatever the ppa address is)
To remove software, it would have just been
sudo apt remove pipewire
Really, the command should have just given a terminal message that said "ppa:pipewire is not installed, so was not removed" or something like that.
You can only access tty if you are able to run init- which if you cannot boot, you may not be able to run init.
How do I install drivers from the tty screen? I have to try. I just can't lose my entire install.
It would be the same commands as above- the trouble is in accessing tty.
This guide may do better than a forum post:
...sigh...
Some days... living just ain't workin' out...
My spidey senses were tingling before deciding to update the kernel and firmware. Luckily, I created a timeshift image right before I did it. Hopefully, I can restore it.
Really appreciate all your help. 
We need more people like you in this world.
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