I looked into this almost 20 years ago when I purchased a Panasonic digital camcorder that featured a 1394 connection. Firewire and USB use different (basically incompatible) protocols. Long story short, the "Firewire to USB" adapter would have to actively translate protocols in real-time -- a big ask. If that doesn't happen, it won't work.
I checked out Lenovo's website and the Y540 model I saw doesn't have a Thunderbolt port or one of the legacy notebook computer ports (PCMCIA / ExpressCard). If your computer is similarly configured, you're probably out of luck trying to rig an external device that could support a Firewire card (and device).
If you buy a Windows desktop computer, it's probably a matter of adding a 1394 card (and enabling support for Firewire in Windows). Or you might look for an older business (rather than consumer) notebook computer, as many of them used to have Firewire ports. For instance, I have an HP ProBook 6475b (AMD A10-4600M) which I bought in 2013, and it has a Firewire port. The HP ProBook 6745b has great build quality. A few months ago I used it to transfer a few long-forgotten dog videos from the Panasonic digital camcorder.