Content adjustments

content/tutorials/generic/bootloader-reloading/bootloader-reloading.md

@@ -5,7 +5,7 @@ difficulty: Advanced
 featuredImage: 'clip'
 ---
 
-In this tutorial we will learn how to burn the bootloader on non-AVR boards using another Arduino board. The bootloader is a small piece of software that allows uploading sketches onto the Arduino board. It comes preprogrammed on the microcontrollers on Arduino boards. Whether the bootloader has been corrupted or intentionally has been removed, it can be restored by burning (also called, flashing or programming) a new bootloader to the board. 
+In this tutorial, we will learn how to burn the bootloader on non-AVR boards using another Arduino board. The bootloader is a small piece of software that allows uploading sketches onto the Arduino board. It comes preprogrammed on the microcontrollers on Arduino boards. Whether the bootloader has been corrupted or intentionally has been removed, it can be restored by burning (also called, flashing or programming) a new bootloader to the board.
 
 >**Note:** If you want to burn the bootloader on AVR boards such as an UNO, Mega, and classic Nano you can check out [these instructions](https://support.arduino.cc/hc/en-us/articles/4841602539164-Burn-the-bootloader-on-UNO-Mega-and-classic-Nano-using-another-Arduino).
 
@@ -14,14 +14,16 @@ In this tutorial we will learn how to burn the bootloader on non-AVR boards usin
 
 >**Note:** Certain Arduino boards can't be used with the sketch that converts it to a programmer. It is possible to use an Arduino board that runs at 5V as the programmer, but you will need to use level shifting circuitry on the programming lines to avoid exposing the target board to 5V logic levels, which would damage it.
 
-| Working | UNtested | Not working |
+| Working | Untested | Not working |
 | ----------- | ----------- |----------- |
 | SAMD architecture boards | AVR architecture boards |Nano 33 BLE |
 
-- An SD slot. This could be built into your Arduino board (e.g., ([MKR Zero](https://store.arduino.cc/products/arduino-mkr-zero-i2s-bus-sd-for-sound-music-digital-audio-data?_gl=1%2A17dcyg9%2A_ga%2AMjEyMzQ2MjgwOC4xNjY1NjUyNTY3%2A_ga_NEXN8H46L5%2AMTY3MTYyNzMzMS4xNjEuMS4xNjcxNjI5ODA2LjAuMC4w)), a shield (e.g., [MKR SD Proto Shield](https://store.arduino.cc/products/mkr-sd-proto-shield?_gl=1%2A1xs1eol%2A_ga%2AMjEyMzQ2MjgwOC4xNjY1NjUyNTY3%2A_ga_NEXN8H46L5%2AMTY3MTYyNzMzMS4xNjEuMS4xNjcxNjMwMzgxLjAuMC4w)), or one of the common SD modules.
+- An SD slot. This could be built into your Arduino board (e.g., [MKR Zero](https://store.arduino.cc/products/arduino-mkr-zero-i2s-bus-sd-for-sound-music-digital-audio-data?_gl=1%2A17dcyg9%2A_ga%2AMjEyMzQ2MjgwOC4xNjY1NjUyNTY3%2A_ga_NEXN8H46L5%2AMTY3MTYyNzMzMS4xNjEuMS4xNjcxNjI5ODA2LjAuMC4w)), a shield (e.g., [MKR SD Proto Shield](https://store.arduino.cc/products/mkr-sd-proto-shield?_gl=1%2A1xs1eol%2A_ga%2AMjEyMzQ2MjgwOC4xNjY1NjUyNTY3%2A_ga_NEXN8H46L5%2AMTY3MTYyNzMzMS4xNjEuMS4xNjcxNjMwMzgxLjAuMC4w)), or one of the common SD modules.
 - An SD card that fits your SD slot.
 - A way to connect the SD card to your computer.
-- A way to make the connections to the SWD pins on your target Arduino board. For the [Nano 33 IoT](https://store.arduino.cc/products/arduino-nano-33-iot?_gl=1%2A80ta1j%2A_ga%2AMjEyMzQ2MjgwOC4xNjY1NjUyNTY3%2A_ga_NEXN8H46L5%2AMTY3MTYyNzMzMS4xNjEuMS4xNjcxNjMwNDIwLjAuMC4w) and the MKR Boards other than MKR1000, we found it the easiest to use a 0.1" pitch 2x3 POGO adapter. You could also solder wires to the test points if you prefer. On the MKR boards other than the MKR1000, the SWD header is on the bottom of the board and is the footprint for a 0.1" pitch 2x3 SMD header. On the MKR1000, it is a 0.05" pitch 2x5 male header on the top of the board, which you will need an adapter 1 and cable for.
+- A way to make the connections to the SWD pins on your target Arduino board. 
+
+For the [Nano 33 IoT](https://store.arduino.cc/products/arduino-nano-33-iot?_gl=1%2A80ta1j%2A_ga%2AMjEyMzQ2MjgwOC4xNjY1NjUyNTY3%2A_ga_NEXN8H46L5%2AMTY3MTYyNzMzMS4xNjEuMS4xNjcxNjMwNDIwLjAuMC4w) and the MKR Boards other than MKR1000, we found it the easiest to use a 0.1" pitch 2x3 POGO adapter. You could also solder wires to the test points if you prefer. On the MKR boards other than the MKR1000, the SWD header is on the bottom of the board and is the footprint for a 0.1" pitch 2x3 SMD header. On the MKR1000, it is a 0.05" pitch 2x5 male header on the top of the board, which you will need an adapter and one cable for.
 
 ## Instructions
 - Connect an SD card to your computer.
@@ -44,7 +46,7 @@ In this tutorial we will learn how to burn the bootloader on non-AVR boards usin
 - Select **File > Examples > Adafruit DAP library > samd21 > flash_from_SD** from the Arduino IDE's menus.
 - Change this line: ```#define SD_CS 4``` 
 
- according to the Arduino pin connected to the SD CS pin. If your board has a built-in SD slot (e.g., MKR Zero 9), then you can change this line:
+ according to the Arduino pin connected to the SD CS pin. If your board has a built-in SD slot (e.g., [MKR Zero 9](https://store.arduino.cc/products/arduino-mkr-zero-i2s-bus-sd-for-sound-music-digital-audio-data)), then you can change this line:
 
  ```
  (!SD.begin(SD_CS)) { 
@@ -74,15 +76,15 @@ In this tutorial we will learn how to burn the bootloader on non-AVR boards usin
 
  SWD pads on MKR boards other than MKR 1000:
 
- ![SWD pads on MKR boards other than MKR 1000](assets/SWDpadsMKR1000.png)
+ ![](assets/SWDpadsMKR1000.png)
 
  MKR1000 SWD header pinout:
 
- ![SWD pads on MKR boards other than MKR 1000](assets/SWDMKR1000header.png)
+ ![](assets/SWDMKR1000header.png)
 
  Nano 33 IoT SWD pads:
 
- ![SWD pads on MKR boards other than MKR 1000](assets/SWDpadsNano33IoT.png)
+ ![](assets/SWDpadsNano33IoT.png)
 
 - Plug the USB cable of the programmer Arduino board into your computer.
 - Select **Tools > Serial Monitor** from the Arduino IDE's menus. You should now see the Serial Monitor output showing the target board detected, and the bootloader file flashed to it successfully.
@@ -99,16 +101,10 @@ If you have a CMSIS-DAP compliant debug probe, you can just do this instead:
 - Select **Tools > Programmer > Atmel EDBG** from the Arduino IDE's menus.
 - Select **Tools > Burn Bootloader** from the Arduino IDE's menus. - The "Burn Bootloader" process should now finish successfully.
 
-You can use [this little open source debugger](https://www.tindie.com/products/ataradov/cmsis-dap-compliant-swd-debugger/)
+You can use [this little open-source debugger](https://www.tindie.com/products/ataradov/cmsis-dap-compliant-swd-debugger/)
 
 **Using a J-Link as the programmer**
 Segger J-Link debug probes (e.g., J-Link EDU Mini) can be used with the Adalink software:
 https://github.com/adafruit/Adafruit_Adalink
 
-This is a fairly complex procedure, so we recommend against this option unless you already own a J-Link and don't have the supplies on hand for one of the other options.
-
- See the table below for more information on which board you can use:
-
- - Working: SAMD architecture boards (e.g., MKR boards, Nano 33 IoT, Zero).
- - Untested: AVR architecture boards (e.g., Mega), but the sketch does compile for them.
- - Not working: Nano 33 BLE
+This is a fairly complex procedure, so we recommend against this option unless you already own a J-Link and don't have the supplies on hand for one of the other options.