diff --git a/advanced/firmware/.cargo/config.toml b/advanced/firmware/.cargo/config.toml
index 4c4601e..cb69dd2 100644
--- a/advanced/firmware/.cargo/config.toml
+++ b/advanced/firmware/.cargo/config.toml
@@ -7,7 +7,7 @@ rustflags = [
 ]
 
 [target.thumbv7em-none-eabihf]
-runner = "probe-run --chip nRF52840_xxAA"
+runner = "probe-run --chip nRF52840_xxAA --erase-all"
 rustflags = [
   "-C", "link-arg=-Tlink.x",
 ]
diff --git a/beginner/apps/.cargo/config.toml b/beginner/apps/.cargo/config.toml
index abfd4b6..3b17a22 100644
--- a/beginner/apps/.cargo/config.toml
+++ b/beginner/apps/.cargo/config.toml
@@ -9,7 +9,7 @@ rustflags = [
 [target.thumbv7em-none-eabihf]
 # set custom cargo runner to flash & run on embedded target when we call `cargo run`
 # for more information, check out https://github.com/knurling-rs/probe-run
-runner = "probe-run --chip nRF52840_xxAA"
+runner = "probe-run --chip nRF52840_xxAA --erase-all"
 rustflags = [
   "-C", "link-arg=-Tlink.x",
 ]