diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ee4fcb3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.img.xz
diff --git a/README.md b/README.md
index 06ece09..21f6aad 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 ## Install OS
 
+
+
 1. install rpiboot `sudo apt install rpiboot`
 2. start `sudo rpiboot`
 3. connect rpi to programming usb port, power on.
@@ -9,6 +11,21 @@
 The device should become available as removable drive (`lsblk`)
 
 
+*flash with imager*
+
+use rpiimager to flash an image. Note: may hang for a long time on 99%. be patient.
+
+*flash with cli*
+
+Download image from https://downloads.raspberrypi.com/raspios_arm64/images/
+
+`wget https://downloads.raspberrypi.com/raspios_arm64/images/raspios_arm64-2026-04-21/2026-04-21-raspios-trixie-arm64.img.xz`
+
+Flash
+
+`xzcat raspios.img.xz | sudo dd of=/dev/sda bs=4M status=progress conv=fsync`
+
+
 
 compulab guide: [OS installation](https://mediawiki.compulab.com/w/index.php?title=IOT-GATE-RPI4:_Raspberry_Pi_OS_image_installation)