diff --git a/firmware/build.sh b/firmware/build.sh
index 3a26cb7..cfb957b 100755
--- a/firmware/build.sh
+++ b/firmware/build.sh
@@ -1,8 +1,11 @@
 #! /usr/bin/env bash
 
+rm -rf left.uf2 right.uf2
+
 if [ "$1" == "--cached" ]; then
     devcontainer exec --workspace-folder ./zmk /bin/bash phiboard-build-cached.sh
 else
+    devcontainer up --workspace-folder ./zmk
     devcontainer exec --workspace-folder ./zmk /bin/bash phiboard-build.sh
 fi
 
diff --git a/firmware/setup-zmk.sh b/firmware/setup-zmk.sh
index dd6c3be..d21982b 100755
--- a/firmware/setup-zmk.sh
+++ b/firmware/setup-zmk.sh
@@ -29,6 +29,8 @@ echo doing a clean build...
     cd app/
     west build -p -d build/left -b seeeduino_xiao_ble -- -DSHIELD=phiboard_left -DZMK_CONFIG="/workspaces/zmk-config"
     west build -p -d build/right -b seeeduino_xiao_ble -- -DSHIELD=phiboard_right -DZMK_CONFIG="/workspaces/zmk-config"
+    echo == clean build completed ==
+    echo future builds can be done with the --cached option
 )
 " > zmk/phiboard-build.sh
 chmod +x zmk/phiboard-build.sh