After applying the fix in github.com/webadb/webadb., webadb.js is usable for fastboot.
It's a very incomplete implementation compared to the adb support but at least it appears to deal with the protocol framing.
Not going to be as much painful low-level work as I expected for it.
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It will need to identify the device model, download the correct factory image zip, extract images and metadata from the zip and feed the right commands / data into the fastboot protocol. Needs an implementation of guiding the user through the locking / unlocking workflow too.
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is that actually needed? AFAIK fastbootd doesn't require a protocol reset and neither should the bootloader impls
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(I ask because I hacked something together using webusb for DFU which *does* requires a USB reset, and on windows, the winusb driver doesn't actually support reset, so the webusb call will always fail)
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