UDBUDB

UDB runs entirely in the browser: WebHID gives a page access only to the devices you pick, and a strict Content Security Policy keeps it from talking to anything but its own origin. Each protocol lives in its own adapter with an allowlist of the commands it may send, so firmware, bootloader and factory-reset commands can't go out even by mistake. A write goes out once, when you let go of the slider; the device is then read back, and if it disagrees UDB restores the old value and says so. The registry of 489 models labels every setting by its evidence: only results observed on real hardware count as verified, and simulators never do. The interface is styled as the device's own instruction booklet, with Dee, a USB stick in a green cap, as the guide.