diff --git a/firmware/Instruction-to-flash-firmware.md b/firmware/Instruction-to-flash-firmware.md
index b3792bf..cd3e288 100644
--- a/firmware/Instruction-to-flash-firmware.md
+++ b/firmware/Instruction-to-flash-firmware.md
@@ -1,14 +1,14 @@
-## Instruction to flash custom firmware
-### For ESP32-S3 based boards (Heltec v3, Heltec v4...)
+## Instruction to flash firmware
+### 1. For ESP32-S3 based boards (Heltec v3, Heltec v4...)
 * To download **.bin** if you already flashed a repeater firmware before and want to KEEP the settings. Do NOT erase device if you want to keep the existing configuration
 * To download  **-merged.bin** if you flash for the FIRST TIME or you want to ERASE the flash and settings.
 * Go to Web Flasher: https://flasher.meshcore.co.uk/
 * Select Custom Firmware
-<img height="384" alt="image" src="https://github.com/user-attachments/assets/d75c1b40-a349-488f-b623-77fbab06ddca" />
 * Click Flash
 <img height="384" alt="image" src="https://github.com/user-attachments/assets/a783b5a6-494e-44f7-b38c-63e4277039e1" />
 
-### For NRF52840 based boards (RAK4631, T-Echo, T-Echo Lite...)
+## 2. For NRF52840 based boards (RAK4631, T-Echo, T-Echo Lite...)
+### Method 1:
 * To download **.zip** file
 * Go to Web Flasher: https://flasher.meshcore.co.uk/
 * Select Custom Firmware
@@ -18,9 +18,10 @@
 * Click Flash.
 <img height="384" alt="image" src="https://github.com/user-attachments/assets/de4eb8ac-e90d-44c2-91a3-2977cfecdf85" />
 
-## Support
-* The firmware is provided as it is without any warranty or support.
-* If you want to support us or get your bug fixed, [Sponsor Us](https://github.com/sponsors/IoTThinks).
 
-## Professional Services
-* If you want custom development for your projects, [Contact Us](https://iotthinks.com/contact-us/)
+### Method 2:
+* To download uf2 file.
+* To press some keys to enter DFU mode and open the NRF2BOOT folder. RAK: Press RESET twice. T-echo Lite: Press RESET, wait for 1s, then press RESET.
+* To drop the uf2 file in the NRF2BOOT folder
+* The device will auto reboot and close the NRF2BOOT folder.
+<img height="192" alt="image" src="https://github.com/user-attachments/assets/4648416a-b906-46e6-84c1-a13f3a7a2a62" />