diff --git a/CMakeLists.txt b/CMakeLists.txt
index d9e7c46..40ec898 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -37,5 +37,15 @@ add_custom_command(TARGET fantemp POST_BUILD
                    COMMAND ${CMAKE_OBJCOPY} -O ihex -R .eeprom
                            $<TARGET_FILE:fantemp> $<TARGET_FILE_DIR:fantemp>/fantemp.hex)
 
+# The board's loader, built here rather than named from memory: consuming
+# pureboot for its geometry alone left the one image this deployment cannot be
+# recovered without outside the repository that pins it. Every parameter is
+# pureboot's own default for this chip - USART0 at 115200 on the 16 MHz crystal
+# `src/board.hpp` declares - and that is measured rather than assumed, the
+# image being byte-for-byte the 386 B the board's slot reads back. It goes on
+# over the wire (`--update-loader`), which is why there is no flash target
+# beside it: no programmer has ever been in this board's path.
+pureboot_add_loader(pureboot)
+
 enable_testing()
 add_subdirectory(test)
diff --git a/libavr b/libavr
index 3678ed7..5c46aad 160000
--- a/libavr
+++ b/libavr
@@ -1 +1 @@
-Subproject commit 3678ed7e5bb90f16021390fa3f877e9d1d2129db
+Subproject commit 5c46aad5d471d547ed0a637072d5e95f427df54f
diff --git a/pureboot b/pureboot
index 416ee18..195d7cd 160000
--- a/pureboot
+++ b/pureboot
@@ -1 +1 @@
-Subproject commit 416ee188e1724e9b871722d279be9b5eedd4b653
+Subproject commit 195d7cd19aab921d53df83d9655c9a5f100d7720