fix(legacy-mcu1): declare matched initramfs firmware and return probe errors

Backport the issue #117 loader fix, declaring the 80 firmware/configuration files actually shipped by legacy-mcu1 rather than the main firmware set. Preserve the existing V3 binaries and loader profiles.

All three modules build against Linux 6.17 headers; inventory, built-module metadata and extracted probe error/re-enumeration regression checks pass. Hardware boot validation remains pending.

INSTALL_SCRIPT.md

@@ -35,6 +35,15 @@ cannot download dependencies because the database is stale, run
 `sudo pacman -Syu` yourself, reboot if the kernel was updated, and rerun the
 installer with headers matching the running kernel.
 
+The USB modules declare the complete firmware set shipped in `fw/`, including
+configuration files and extension patches, so initramfs tools can include those
+files when they include the modules. Rerun the installer after updating the
+driver to rebuild DKMS modules and refresh the current kernel's initramfs.
+If the adapter only works after reloading its modules after boot, check that
+the initramfs contains its `aic8800*/` firmware directory (issue #117).
+Custom firmware paths supplied with `aic_fw_path` still need to be included
+in the initramfs by the administrator.
+
 > For more information, please refer to the [README.md](README.md) file.
 
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