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-rw-r--r--Documentation/mainboard/lenovo/Sandy_Bridge_series.md4
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diff --git a/Documentation/mainboard/lenovo/Sandy_Bridge_series.md b/Documentation/mainboard/lenovo/Sandy_Bridge_series.md
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+++ b/Documentation/mainboard/lenovo/Sandy_Bridge_series.md
@@ -22,6 +22,10 @@
```
## Installation instructions
+
+Flashing coreboot for the first time needs to be done using an external
+programmer, because vendor firmware prevents rewriting the BIOS region.
+
* Update the EC firmware, as there's no support for EC updates in coreboot.
* Do **NOT** accidentally swap pins or power on the board while a SPI flasher
is connected. It will destroy your device.