The file is approoved and can be downloaded here:
https://morph.zone/modules/mydownloads/singlefile.php?lid=333
Feel free to test.
Note that original m68k serial.device grabs serial port resources and can not free them, so to be able to use new device you'll have to install it, reboot, and only then try it.
If you decide to use new device under name "8n1.device" and keep original serial.device, the same rule applies. This means that if any program opened serial.device at least once, you won't be able to use 8n1.device even after you close that program. A reboot will be needed. It's a feature of original m68k serial.device.
An alternative way to unload it is "AVAIL FLUSH" command, but to tell the truth i don't remember exactly if this really works. I played with it a while ago.

[ Edited by Sonic on 2005/9/12 12:03 ]