diff --git a/README.md b/README.md
index f8cb487..1151336 100644
--- a/README.md
+++ b/README.md
@@ -135,7 +135,7 @@ make shell
 
    * Use `lsblk` to find device name   
 
-   * `dd if=out/airgap.iso of=/dev/<your_device> bs=4M status=progress oflag=direct`
+   * `dd if=out/airgap.iso of=/dev/<your_device> bs=4M status=progress conv=fsync`
 
 2. Use the `sdtool` to lock the SD Card:
 
@@ -156,7 +156,7 @@ make shell
 
    d. Test that the card can't be written to:
 
-      * `dd if=out/airgap.iso of=/dev/sdb bs=1M conv=sync status=progress`
+      * `dd if=out/airgap.iso of=/dev/sdb bs=1M status=progress conv=fsync`
 
 3. Verify that the hash of `airgap.iso` matches what's flashed on the SD card: