32-bit or 64-bit ARM depending on the specific chip configuration.
Since these are generic units, you won't find updates through a standard manufacturer website. Instead, you must rely on developer repositories and community forums: yt9260ver11 firmware
Copy the firmware package (usually named update.zip or left as the raw XYAUTO zip archive) to the root directory of your formatted USB drive. Do not put it inside any folders. 32-bit or 64-bit ARM depending on the specific