Vocore screen freezing or disconnecting

Last updated 4 August 2026 · SimHub 9.11.22

A Vocore that disconnects and reconnects in a loop, or freezes and never comes back, is a documented problem rather than a bad unit — SimHub's own USB troubleshooting attributes Vocore screen issues to USB instability, and calls out early Vocore MPRO firmware as unstable specifically. Update the firmware first, using the official v2scrctl tool, because that is the only fix aimed at the actual cause. Then do the two Windows USB power settings, which stop Windows powering the port down underneath it, and only then look at the cable. In that order, because a firmware update makes the other two easier to judge.

Vocore became the common SimHub dash when Nextion support ended, so a lot of these are in service and a lot of them are running whatever firmware shipped in the box.

Firmware first

SimHub's documentation names the fix directly: update the Vocore firmware through the official v2scrctl tool. Early MPRO firmware is singled out as unstable, so a screen bought early in a production run is the likely case.

Do this before buying cables. The order matters because the symptoms are identical. A firmware fault, a power-management fault and a cable fault all look like "it disconnects at random", and if you change three things at once you will not know which one mattered — and you will not know what to do when it comes back.

Do the update from a rear motherboard port with nothing else on that controller, and do not have SimHub running while you do it.

Then stop Windows powering the port down

A dashboard screen updating over USB can look idle to Windows' power management, and Windows is allowed to switch the port off. Two separate settings control this and you need both:

Device Manager → Universal Serial Bus controllers → every USB Root Hub → Properties → Power Management → clear Allow the computer to turn off this device to save power.
Control Panel → Power Options → advanced settings → USB settings → USB selective suspend setting → Disabled.
Reboot. Neither takes full effect until you do.

Do every root hub. There are usually several and the list does not tell you which one your screen is on. Skipping one is how people conclude this fix does not work.

Then the physical layer

A rig is a metal frame with a direct drive motor in it, and a dashboard screen sits about as close to that motor as anything can. If firmware and power settings have not fixed it:

Shielded cable, under about 1.5 metres. Length is the single easiest thing to get wrong on a screen mounted at the top of a wheel deck.
A ferrite core on the run, which is named in SimHub's USB guidance for exactly this.
Route it away from the wheelbase power cable rather than cable-tied alongside it — the tidy routing and the correct routing are often not the same.
Its own USB controller if you can manage it. A screen sharing a controller with a USB sound card is a documented recipe for both misbehaving.

If it survives on the bench with a short cable and fails on the rig, you have your answer and it is not the screen.

Common questions

Why does my Vocore screen keep disconnecting?

USB instability is the documented attribution, and early Vocore MPRO firmware is specifically called out as unstable. Update the firmware with the official v2scrctl tool first, then disable USB selective suspend and the per-hub power saving in Windows, then look at the cable.

How do I update Vocore firmware?

With the official v2scrctl tool, which is the method SimHub's own documentation points to. Do it from a rear motherboard port, with nothing else on that controller and SimHub closed.

My Vocore freezes on one frame and never recovers. Same cause?

It is the same family — the wiki lists both "rapidly disconnecting and reconnecting" and "freezing and failing to reconnect" together. Work the same order: firmware, power settings, then cable and routing.

Is a powered hub a good idea?

It can help when the problem is a shared controller, because it moves the screen away from whatever else was competing with it. It will not help an interference problem and it will not help a firmware fault, so it is not the thing to try first.

Should I have bought a Nextion instead?

No. Nextion support ended and SimHub's own guidance is to exclude Nextion from new builds — Vocore is the recommended replacement. A Vocore on current firmware is the better position to be in.

Sources

SimHub is developed independently by Wotever and is not affiliated with oesimracing. This page was checked against SimHub 9.11.22 on 4 August 2026; where the interface has moved on since, the version stamp tells you how far. More on what SimHub is and what it costs.