Update README.md

README.md

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 ## PowerSaving MeshCore firmware: 
 Feature firmwares are for Meshcore. They have more experimental, advances features and bug fixes. These features will be pushed to MeshCore to merge to the main development.
 * Download at [RELEASES](https://github.com/IoTThinks/EasySkyMesh/releases)
-* Please check the [**Instruction to flash custom firmware**](https://github.com/IoTThinks/EasySkyMesh/blob/main/firmware/Instruction-to-flash-firmware.md).
 * Source code changes: [Source code](https://github.com/IoTThinks/MeshCore/tags)
 
-## Have Suggestion?
+### Suggestion?
 * To make the firmware better, you can **suggest us** your wanted features [HERE](https://github.com/IoTThinks/EasySkyMesh/discussions/categories/ideas)
+
+### Instruction
+#### 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
+* 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...)
+* To download **.zip** file
+* Go to Web Flasher: https://flasher.meshcore.co.uk/
+* Select Custom Firmware
+* Click Enter DFU mode
+* Do NOT erase device if you want to keep the existing configuration
+* Select the downloaded zip file
+* 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.