![]() ![]() Additional bytes may contain an (ascii) informative message.Ī. The first four bytes of the response are “OKAY”, “FAIL”, “DATA”, or “INFO”. Host sends a command, which is an ascii string in a single packet no greater than 64 bytes.Ĭlient response with a single packet no greater than 256 bytes. Fastboot data is wrapped in a simple protocol see below for details.Device will act as the server, fastboot will be the client.The protocol is entirely host-driven and synchronous (unlike the multi-channel, bi-directional, asynchronous ADB protocol).Max packet size must be 64 bytes for full-speed, 512 bytes for high-speed and 1024 bytes for Super Speed USB.Two bulk endpoints (in, out) are required. ![]() It is designed to be very straightforward to implement, to allow it to be used across a wide range of devices and from hosts running Linux, macOS, or Windows. The fastboot protocol is a mechanism for communicating with bootloaders over USB or ethernet. ![]()
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