Before you flash your board, you must verify the hardware revision. Even if the DSV56RJBK is objectively the "best" in terms of features, applying it to an incompatible hardware version can cause a permanent failure.
The "best" firmware is often categorized by its intended use: Official Manufacturer Releases dsv56rjbk firmware best
Once you provide that, I can write a proper , best-practice recommendation , or troubleshooting piece for you. Before you flash your board, you must verify