The LG P970 Optimus Black, released in 2011, was a device that lived up to its name. It was sleek, impossibly thin for its time, and boasted a "Nova" display that could outshine the competition. However, for many owners, the device was defined not by its hardware, but by its software journey—or the lack thereof.
LG was initially hesitant. The P970 had a single-core TI OMAP 3630 processor, and many manufacturers claimed single-core devices couldn't handle ICS smoothly (a claim later proven false by developers). firmware+change+update+on+lg+p970+optimus+black
Updating the LG P970 Optimus Black is a bit of a throwback, as the official support for this device peaked years ago. Depending on your current version, you can either move to the final official release or explore custom community-made firmware. Official Update Path The Unfinished Story of the LG P970 Optimus
If you want to move beyond Android 4.0, you must use unofficial methods. Be aware that these carry a risk of "bricking" (permanently disabling) the device. LG was initially hesitant