Unfragile

"bootloadhid" is not named by any source here, so the closest matches are tools for USB HID device access and firmware flashing. libusb provides generic cross-platform user-mode access to USB devices 10, and flashrom identifies, reads, writes and erases flash chips for firmware images 9. Microsoft's listed Arduino HID actions are dummy connect/status/disconnect calls 14 and do not perform a bootload.

A question back: Do you mean a specific bootloader project or a host-side tool to talk to a HID bootloader on a particular microcontroller?

1
libusblibusb.infowebsite read, tools not yet checked
A C library giving user-mode, cross-platform access to USB devices, which a HID bootloader host tool can build on 10.
Website Docs
2
flashromflashrom.orgwebsite read, tools not yet checked
A utility for identifying, reading, writing, verifying and erasing flash chips to flash firmware images 9.
Website Docs
3
probe-rsprobe.rswebsite read, tools not yet checked
An embedded toolkit for flashing and debugging microchips through a probe 5.
Website Docs

Sources

5probe-rsprobe.rs · read 2026-10-29
9flashrom README — flashrom v2.0.0-devel (git:v1.8.0-111-g8aad843e) documentationflashrom.org · read 2026-10-29
10libusblibusb.info · read 2026-10-29
14ufo: declares "arduino_hid_connect" (the record we read)github.com · read 2026-10-24

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Connect to the Arduino HID device (dummy).
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