Hi3520A, Hi3520D, Hi3521, Hi3521A, Hi3531, Hi3531A, Hi3535, Hi3536. Device Types:

You are dealing with an H.264/H.265 hybrid. Flashing the wrong chipset (Hi3535 vs Hi3536) will kill the device permanently.

: Updates can also optimize the device's performance, reducing lag, improving playback smoothness, and enhancing overall system stability.

: Offers indexed firmware files and guides for this specific version.

Look for an 8-digit sequence within the system version (e.g., in V4.02.R11.00031095.12001 , the key digits are Physical Inspection: