diff --git a/cmd/flashWrite.go b/cmd/flashWrite.go
new file mode 100644
index 0000000..b8ebe72
--- /dev/null
+++ b/cmd/flashWrite.go
@@ -0,0 +1,41 @@
+package cmd
+
+import (
+	"encoding/binary"
+	"encoding/hex"
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	flashWriteCmd.Flags().StringVarP(&memAddress, "address", "a", "", "memory address to begin writing")
+	flashWriteCmd.Flags().StringVarP(&writeData, "data", "d", "", "data to write in hex")
+	rootCmd.AddCommand(flashWriteCmd)
+}
+
+// Data to write to device
+var writeData string
+
+var flashWriteCmd = &cobra.Command{
+	Use:   "flashWrite",
+	Short: "Write data over flash sectors",
+	Long:  "Writes data over flash sectors",
+	Run: func(cmd *cobra.Command, args []string) {
+
+		// data to write
+		data := mustParseHex(writeData)
+
+		// Convert hex address to uint32
+		addr := binary.BigEndian.Uint32(mustParseHex(memAddress))
+
+		resp, err := kk.FlashWrite(addr, data)
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+
+		fmt.Println(hex.EncodeToString(resp))
+	},
+}
diff --git a/pkg/keepkey/input.go b/pkg/keepkey/input.go
index 845ac1a..3f6c732 100644
--- a/pkg/keepkey/input.go
+++ b/pkg/keepkey/input.go
@@ -44,6 +44,7 @@ func promptPin() (string, error) {
 	prompt := promptui.Prompt{
 		Label:    "Pin",
 		Validate: validate,
+		Mask:     '*',
 	}
 	res, err := prompt.Run()
 	if err != nil {