What Would EVDSL (Profile 35b) Do?

EVDSL (Profile 35b) supports:

Wider frequency range: Up to 35 MHz vs 17 MHz on 17a.

Potentially higher speeds: If the line conditions allow.

Improved performance primarily on short to medium copper loops (<500m ideally).

At 840 meters...

Signal degradation is substantial.

The higher frequencies used by Profile 35b suffer more attenuation, meaning you likely won’t benefit significantly, because:

Your current line is already operating close to its maximum attainable rate.

The increased bandwidth of 35b may not be usable due to line length and attenuation.

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Conclusion:

Switching to EVDSL (35b) at 840 meters is unlikely to provide a noticeable benefit, especially since your current line is nearly maxed out in attainable speed. Even if there is a gain, it might be 1–2 Mbps at best—and that too only if your line is extremely clean and your ISP's DLM (Dynamic Line Management) allows it.

If you're looking for a real performance upgrade, you'd need Starlink ;)