Yes, but you also need a jailbreak with nonce override (checkra1n does NOT work on A12). This is why downgrading modern iPhones is nearly impossible despite SHSH hosts.
By taking a few minutes to "host" your SHSH blobs today, you ensure that you—not Apple—decide which software runs on your hardware. current tools available for saving blobs on macOS or Windows? SHSH - The Apple Wiki SHSH blobs are unique to each device by ECID. The Apple Wiki shsh host
Complete Guide to SHSH Hosts, Blobs, and iOS Downgrading An refers to a server or web-based platform used to fetch, save, or simulate the digital signatures required to install specific iOS firmware versions on Apple devices. In the iOS jailbreaking and modding community, managing your "SHSH blobs" via a dedicated host is the primary method for downgrading or upgrading an iPhone or iPad to an unsigned version of iOS. Yes, but you also need a jailbreak with