First off, we're gonna need put the model.szs and put in into the sarc_tool folder. Then you want to open up Windows Powershell into the folder we just went in.
Now you want to type .\sarc_tool.exe .\model.szs It will now extract the .bfres from the file
1.1. BFRES file extraction Open the embedd_extract folder and execute the .exe file. Locate the .bfres file you just created and it will extract the textures.bntx into the file's directory.
2. Editing Open the bntx_injector folder and execute the .exe file. You will now open the textures.bntx file and export whatever you want to edit/change. When you've finished doing so, click replace and locate your edited file.You can now close the bntx_injector window. (it autosaves)
3.1. BNTX to BFRES We will now repack the .bntx into he .bfres file. (make sure you install Python above) Execute bfres_tex_replacer.py. Now locate your .bfres then your .bntx, it will repack automatically. You can now delete the .bntx if you want.
3.2. BFRES to SZS This is the final step. Drag your .bfres file into the libyaz0 folder and do the same as for sarc_tool, open Windows Powershell but instead, this time type .\libyaz0.exe -c -level 1 .\model.bfres You will now see the .szs file, you can place it in the right directory on your SD card and enjoy.