USB at the device.
Connect one GHL controller directly, or connect up to three supported controllers to a single ESP32 using an inexpensive powered USB 2.0 hub. The bridge connects to your local Wi-Fi.
In development · Beta interest
GHL firmware updates.
Without the cable run.
Update your main GHL controller over local Wi-Fi, or update a supported PAB device in place with the rest of the chain connected. Tested update paths restart the device by software, so there’s no manual power cycle during a normal update.
I’m interested in beta testing →An independent project by TelegrahamTested.
The idea
Less setup between you and an update.
A browser you already use.
Access the bridge from your phone or computer, with a straightforward interface to guide the update.
A clearer path through.
Choose the main controller or a supported PAB target in the browser. Follow the transfer and verification, then let the device restart by software on tested paths. Manual power cycling is available as a recovery fallback.
Beta feature · Multiple controllers
More GHL devices. One ESP32.
An inexpensive powered USB 2.0 hub lets you connect up to three supported GHL controllers to a single Sentinel Flash ESP32 bridge.
Keep your controllers connected and choose which one to manage in the browser. Each controller can also provide access to its supported PAB accessories. Updates run on one selected controller or PAB device at a time.
Use one powered hub connected directly to the bridge. Device compatibility and PAB relay requirements still apply.
Device compatibility · November 2026
Which GHL devices work?
The bridge connects by USB to the main device, and you run the update from a browser over Wi-Fi. In-place PAB updates depend on the controller, the target device, and compatible relay support on any intermediate devices.
Supported & confirmed in beta
Light WiFi
Firmware update, verification, software restart and settings restore, tested on a USB hub. Additional variants, including the pump controller, still need testing.
ProfiLux Mini WiFi
Connects and reads on a USB hub. Firmware updates and restores are off in this beta.
Doser 2.1 Standalone
Connect it directly to the bridge. Firmware update, verification and software restart. This controller can also update supported PAB accessories without disconnecting them from their bus. All Doser actions are off on a USB hub until that has been tested.
ProfiLux 4 on 7.53
Stock 7.53 reinstall with full flash verification and software restart, tested on a USB hub. This controller can also update supported PAB accessories without disconnecting them from their bus.
Tested with Doser 2/2.1 EXT, Maxi 2.2 EXT and ION Director. Compatibility depends on the devices along the PAB path.
In development
Mitras LX7 — next lighting target. Its USB update and restart workflow still needs bench validation.
Other models, including Mitras LX6, LX8 and Lightbar, ProfiLux 4e and 4.1, and Doser 3, have no confirmed support listed here.
Help shape Sentinel Flash
Want to try the beta?
Tell me which GHL devices you use. I’ll get in touch when there’s a suitable opportunity to test.
Signup registers your interest. It does not guarantee an invitation or immediate access.
Check the device compatibility section above before registering. Firmware access is coordinated through the beta.
A few things to know.
Is this the GHL Wi-Fi module firmware updater?
Sentinel Flash focuses on updating the GHL device’s firmware through its USB connection. Device firmware and the device’s Wi-Fi module firmware are separate.
What about recovery after an interrupted update?
Recovery tooling is part of Sentinel Flash’s scope. It supports the main goal of straightforward wireless firmware updates; recovery features and supported recovery states are still being developed.
Is this an official GHL product?
No. Sentinel Flash is an independent TelegrahamTested project and is not affiliated with or endorsed by GHL. GHL product names belong to their respective owners.
How will my signup information be used?
Your name, email, and device details are stored privately for beta coordination. They are not displayed publicly. Contact contact@telegrahamtested.com to request removal.