Messing with the new MediaTek MT7687 chips (WiFi + Cortex-M4). Step one: rewrite the horrible Windows-only flasher.https://github.com/marcan/mt7687flash …
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roughly. They are all basically the same. You can ID the chip easily enough, at least.https://github.com/xobs/fernly/blob/master/fernly-usb-loader.c …
Looks pretty different actually, totally different command/response formats AFAICT, and this one uses XMODEM for the actual data.
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Basically, on these, the bootrom just takes a raw blob via XMODEM, dumps it into SRAM, and jumps to it. Rest is in their flasher blob.
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You can actually vanilla XMODEM the app bootloader (the stuff at 0 in flash) into the bootrom in recovery mode and it'll just run it.
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