Hi JJ. Welcome. Akemasite omedetou gozaimasu. Happy new year.
I think technically the 2010 MacBook Pro should work. What version of MacOS is it running? I suspect it’s stuck on Mojave.
Does the USB port work fine with other devices? Or are you using a hub? If so, try removing the hub.
There may also be a driver issue. I’m not certain about the A25 but I believe other Atomstack lasers use CH340 usb interface chip. This is the same as Arduino devices. Lots of discussion about it here:
Mojave - CH34x USB drivers - installation - Using Arduino / Installation & Troubleshooting - Arduino Forum
Here’s one thing I found though at:
GitHub - adrianmihalko/ch340g-ch34g-ch34x-mac-os-x-driver: CH340G CH34G CH34X Mac OS X driver
If you have ever installed a 3rd party driver before Mojave you might have a driver conflict.
Do not install if you have the current macOS Mojave 10.14 or later. macOS Mojave 10.14 (released in October 2018) includes a CH34x driver by Apple. If both Apple’s and the OEM driver are installed, they will create conflicting non-functional serial ports. Steps 1 to 3 below can be useful to remove the conflicting OEM drivers.
And here are the 3 steps they’re talking about:
Installation
1. Unplug any CH34* devices.
2. Unload the old drivers if running:
sudo kextunload /Library/Extensions/usbserial.kext
sudo kextunload /System/Library/Extensions/usb.kext
3. Remove the old driver by issuing one of the following commands (depending on your installation):
sudo rm -rf /System/Library/Extensions/usb.kext
sudo rm -rf /Library/Extensions/usbserial.kext