added hardmod guide into the index (#1)

* added hardmod guide

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* Add instructions to remove NOCASH footer

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pages/_en-US/ds-index/hardmod.md

@@ -12,4 +12,103 @@ Hardmodding is when you physically solder the motherboard of the Nintendo DSi to
 ![Original DS motherboard with touch-points labeled](https://media.discordapp.net/attachments/547986366357700620/736370094392999947/mobo_pinout.png)
 
 ### Nintendo DSi
-Follow the "Hardware NAND Mod Guide" and "Decrypting your NAND" of [this](https://gbatemp.net/threads/dsi-downgrading-the-complete-guide.393682/) guide.
+
+To hardmod a Nintendo DSi / DSi XL (LL) you will need:
+  - [Pencil tipped soldering iron](https://www.amazon.com/dp/B01N4571Q6)
+  - [Very fine wire](https://www.amazon.com/dp/B01MXGNTA4), 28AWG or smaller, preferably 30AWG+ 
+  - SD to microSD adapter
+  - An SD card reader able to read eMMC chips running in single data-line mode. [Here's a known working one](https://www.amazon.com/dp/B006T9B6R2)
+  - [Win32DiskImager](https://sourceforge.net/projects/win32diskimager/) and [HxD](https://mh-nexus.de/en/downloads.php?product=HxD20) if on Windows
+  - A valid NAND backup of the DSi you are hardmodding
+  - To be comfortable soldering to pads that are as small as 0.5mm in diameter
+
+#### DSi side A pinouts
+![DSi side A pinouts](/assets/images/dsi-hardmod/side_a.jpg)
+#### DSi side B pinouts
+![DSi side B pinouts](/assets/images/dsi-hardmod/side_b.png)
+#### DSi XL side B pinouts
+![DSi XL side B pinouts](/assets/images/dsi-hardmod/dsi_xl_side_b.png)
+
+- You will need to solder the points on the motherboard to the microSD card adapter
+  - CMD to pin 2
+  - GND to pins 3 and 6
+  - CLK to pin 5
+  - DAT0 to pin 7
+
+#### Soldered microSD adapter example
+![microSD example](/assets/images/dsi-hardmod/sd.jpg)
+
+- Insert the microSD card adapter into your computer
+  - **WARNING** - Windows will ask you to format it: **DO NOT** format it - this might cause irrepairable damage
+
+#### Removing the no$gba footer
+You will first need to remove the NOCASH footer from the backup you are flashing to the DSi. This can be done by running the hiyaCFW helper application found [here](https://github.com/mondul/HiyaCFW-Helper/releases/latest).
+
+1. Download the version for the operating system you are using
+1. Run the script, selecting the NAND backup you wish to flash to your DSi
+1. Switch to NAND mode with the button to the left of the file path
+1. Click `Start` to create the NAND backup without the no$gba footer
+
+- Once the script completes, there should be a file with a long name ending in `-no-footer.bin` in the folder where your terminal is open
+  - Use this file as the NAND image you flash onto the DSi
+
+
+#### Windows instructions (skip for macOS / Linux)
+
+1. Open Win32DiskImager
+1. Click the folder icon and browse to your desktop. In the text box, write NAND_0.bin. When selecting type, choose All types *.* 
+1. Choose the device that is the DSi and click read
+1. Once it is done, click the folder icon, change the name to NAND_1.bin and read again
+1. Open HxD and drag both files into the editor. Go to the top bar, click "Analysis", click "File compare" from the drop down menu, then click "Compare".
+1. Choose to compare both files then click OK when done
+  - If it says "The chosen files are identical.", you are good to go to the next section
+  - If it doesn't say that, and both NANDs aren't around 240MB, dump NAND_1/NAND_0 again
+1. Open Win32DiskImager, click the folder icon and choose your existing NAND backup you created before
+1. Flash it with the `Write` button
+1. Unplug the SD card adapter and attempt to turn on the DSi
+
+#### Linux / macOS instructions (skip if on Windows)
+
+
+1. Work out where the SD card is mounted
+  - Linux:
+    1. Unplug the SD card adapter
+    1. Run `lbslk` on a terminal
+    1. Plug in the SD card adapter
+    1. Run `lbslk` again
+    1. This time a new device should appear
+      - It may be called `/dev/sdb`, make sure you note down what it is called on *your* terminal
+
+  - macOS:
+    1. Unplug the SD card adapter
+    1. Run `df` on a terminal
+    1. Plug in the SD card adapter
+    1. Run `df` again
+    1. A new device should appear in the list
+      - It may be called `/dev/disk1s1`, make sure you note down what it is called on *your* terminal
+
+1. Dump the NAND
+  - Run the following command on a terminal:
+    - `cat {device-name} > nand0.bin` 
+    - Replace {device-name} with the SD card mount location
+    - E.g `cat /dev/sdb > nand0.bin`
+    - Then run `cat {device-name} > nand1.bin`
+    
+
+1. Compare NAND dumps
+  1. Run the following command:
+    - Linux : `md5sum nand0.bin nand1.bin`
+    - macOS : `md5 -r nand0.bin nand1.bin`
+  1. Check that the hash generated matches each other
+  1. If not, redump the NAND, adjusting the wiring if necessary
+  1. Keep on redumping the NAND until the hashes are identical
+
+1. Flash NAND
+  1. Locate the NAND backup you created before on the console
+  1. Run the following command:
+    - `cat {existing-nand-backup} > {device-name}`
+    - Replace `{existing-nand-backup}` with the location and name of your old NAND backup
+    - Replace `{device-name}` with the mount point of the SD card
+    
+At this point you may unplug the SD card adapter and attempt to turn on the DSi.
+If all went well, the DSi should have booted to the state it was when the backup was created!