diff --git a/How_to_use_Firmware.md b/How_to_use_Firmware.md
index 97d3af0..05077d4 100644
--- a/How_to_use_Firmware.md
+++ b/How_to_use_Firmware.md
@@ -3,7 +3,7 @@ In this file you can look up how to [edit](#Editing-the-code), [compile](#Compil
 
 ## Editing the code
 We are using [Visual Studio Code](https://code.visualstudio.com/download) to edit this project! Simply download and install it!
- - Install the [ARM-GCC](https://mynewt.apache.org/latest/get_started/native_install/cross_tools.html) version [9.3.1 Compiler](https://developer.arm.com/downloads/-/gnu-rm) and remember the path where you installed it.
+ - Install the [ARM-GCC](https://mynewt.apache.org/latest/get_started/native_install/cross_tools.html) version [10.3.1 Compiler Tested](https://developer.arm.com/downloads/-/gnu-rm) and remember the path where you installed it.
  - Install the [C++ Extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode.cpptools) in VS-Code.
  - Create a new IntelliSense Configuration:
 	 - press F1 in VS-Code and enter `C/C++: Edit Configurations (UI)`
@@ -35,6 +35,9 @@ We are using [Visual Studio Code](https://code.visualstudio.com/download) to edi
 - go into folder and run `make`
 
 ## Debugging the code
-- Install [openocd](https://mynewt.apache.org/latest/get_started/native_install/cross_tools.html)
+- Install [nRF Util](https://www.nordicsemi.com/Products/Development-tools/nrf-util)
+  - Move it to a known path like `C:/nrfutil/`
+  - Add this path to `PATH` Environment Variable
 - Install [Cortex-Debug](https://marketplace.visualstudio.com/items?itemName=marus25.cortex-debug) VS-Code Extension
+- Install [Segger J-Link](https://www.segger.com/downloads/jlink)
 - MORE INFO ADDED LATER
\ No newline at end of file
diff --git a/firmware/Makefile.defs b/firmware/Makefile.defs
index a3e00c1..ae28087 100644
--- a/firmware/Makefile.defs
+++ b/firmware/Makefile.defs
@@ -1,8 +1,8 @@
 #    In the nrf52 sdk, will auto detection current platform: posix or windows.
 #    If your <arm-none-eabi> is already installed, and version and path is this:
 #    Version     : 10.3.1
-#    Windows-path: C:/Program Files (x86)/GNU Arm Embedded Toolchain/9 2020-q2-update/bin/
-#    POSIX  -path: /usr/local/gcc-arm-none-eabi-9-2020-q2-update/bin/
+#    Windows-path: C:/Program Files (x86)/GNU Arm Embedded Toolchain/10 2021.10/bin
+#    POSIX  -path: /usr/local/gcc-arm-none-eabi-10.3-2021.10/bin/
 #    You can ignore this file modify.
 # Warning: your toolchain path not allow PR to public repo!!!
 # If you need define the toolchain path, plz delete annotate and change it.
diff --git a/firmware/nrf52_sdk/components/toolchain/gcc/Makefile.posix b/firmware/nrf52_sdk/components/toolchain/gcc/Makefile.posix
index 6a935fc..04bbd93 100644
--- a/firmware/nrf52_sdk/components/toolchain/gcc/Makefile.posix
+++ b/firmware/nrf52_sdk/components/toolchain/gcc/Makefile.posix
@@ -1,3 +1,3 @@
-GNU_INSTALL_ROOT ?= /usr/local/gcc-arm-none-eabi-9-2020-q2-update/bin/
+GNU_INSTALL_ROOT ?= /usr/local/gcc-arm-none-eabi-10.3-2021.10/bin/
 GNU_VERSION ?= 9.3.1
 GNU_PREFIX ?= arm-none-eabi
diff --git a/firmware/nrf52_sdk/components/toolchain/gcc/Makefile.windows b/firmware/nrf52_sdk/components/toolchain/gcc/Makefile.windows
index 54dbc80..cda3cda 100644
--- a/firmware/nrf52_sdk/components/toolchain/gcc/Makefile.windows
+++ b/firmware/nrf52_sdk/components/toolchain/gcc/Makefile.windows
@@ -1,3 +1,3 @@
-GNU_INSTALL_ROOT ?= C:/Program Files (x86)/GNU Arm Embedded Toolchain/9 2020-q2-update/bin/
-GNU_VERSION ?= 9.3.1
+GNU_INSTALL_ROOT ?= C:/Program Files (x86)/GNU Arm Embedded Toolchain/10 2021.10/bin/
+GNU_VERSION ?= 10.3.1
 GNU_PREFIX ?= arm-none-eabi
\ No newline at end of file