From 8cd3f7072134698b32cf232c35819d94ee0311e6 Mon Sep 17 00:00:00 2001
From: linuswck <linuswck@m-labs.hk>
Date: Thu, 7 Mar 2024 11:55:10 +0800
Subject: [PATCH] Add Instructions for Erasing Flash Settings

---
 README.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/README.md b/README.md
index 0603568..34de5e1 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,15 @@ On a Windows machine install [st.com](https://st.com) DfuSe USB device firmware
 - remove jumper
 - cycle power to leave DFU update mode
 
+### Erasing Flash Settings
+The flash settings are stored in the last flash sector(ID: 11) of bank 0 of stm32f405. With JTAG/SWD adapter connected, you can erase the flash settings without erasing the firmware with the following commands. You may find it useful if you have set the wrong IP settings.
+
+With JTAG/SWD adapter connected, issue the following command:
+
+```shell
+openocd -f interface/stlink.cfg -f target/stm32f4x.cfg -c "flash init; init; halt; flash erase_sector 0 11 last; reset; exit"
+```
+
 ### OpenOCD
 ```shell
 openocd -f interface/stlink.cfg -f target/stm32f4x.cfg -c "program target/thumbv7em-none-eabihf/debug/kirdy verify reset; exit"