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docs/novacustom.md: document v0.9.0 downgrade bug #1145

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Expand Up @@ -19,6 +19,15 @@ former method was testing our laptops over SSH with the help of
[DCU](https://github.com/Dasharo/dcu). You can find the instructions for both
approaches below.

## Warning: Downgrading firmware

Downgrading to v0.9.0 may trigger a bug, where the EC firmware update feature in
coreboot may cause an EC brick.

To work around this issue, you **must downgrade the BIOS and the EC at the same
time**. First, downgrade the BIOS, then, without rebooting in between, downgrade
the EC firmware.

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@philipanda philipanda Nov 5, 2025

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Maybe add a link to the manual EC update procedure?

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@filipleple filipleple Nov 5, 2025

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+1

## FTDI converter

The obvious prerequisite is that you have an FTDI FT232-based USB-TTL
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