prebuilt.conf: updating FULL_BINHOST

Change-Id: I27e0a7fc90ab64ea38fc6eb9bc1176ccb850b90f
diff --git a/overlay-amd64-generic/prebuilt.conf b/overlay-amd64-generic/prebuilt.conf
index 7151858..5b23652 100644
--- a/overlay-amd64-generic/prebuilt.conf
+++ b/overlay-amd64-generic/prebuilt.conf
@@ -1,2 +1,2 @@
 
-FULL_BINHOST="gs://chromeos-prebuilt/board/amd64-generic/full-R77-12299.0.0-rc2/packages/"
+FULL_BINHOST="gs://chromeos-prebuilt/board/amd64-generic/full-R77-12300.0.0-rc1/packages/"