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legacy/docs: add additional info required to flash custom firmware

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Pavol Rusnak 2019-07-08 11:43:11 +02:00
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legacy/README.md
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@ -54,6 +54,8 @@ Step 3 should produce the same sha256 fingerprint like your local build (for the
1. Install python-trezor: `pip install trezor` ([more info](https://github.com/trezor/python-trezor))
2. `trezorctl firmware_update -f build/trezor-TAG.bin`
*Note: if your device is on the latest bootloader version and you flash custom firmware then you will receive a hard fault warning when booting the firmware image. To avoid this issue, just remove the code in startup.s added by [this commit](https://github.com/trezor/trezor-firmware/commit/222c9ea46c7574cb52d4713c481438a32b85e692#diff-178d0ab7c4debbcf430a0fad8fa06a5c).*
## Building for development
If you want to build device firmware, make sure you have the