Theme Shop

The Theme Shop was added in 9.0.0-20, which allows users to purchase Home Menu Theme. The shop file structure is based on the BOSS file. When the shop starts booting, it requests a top file from https://npdl.cdn.nintendowifi.net/p01/nsa/dMtiFHzm5OOf0y2O/thmtop/<countrycode>/<language>/top. Because Nintendo has closed the Shop alongside eShop on March 27, 2023, the Top file was edited to only have "New Themes" as an option.

Available Themes Info

After the top file, when you click any Theme Category or All themes, the 3DS Downloads the available themes for the country on https://npfl.c.app.nintendowifi.net/p01/filelist/dMtiFHzm5OOf0y2O/thmdtls?c=<countrycode>&l<language>=&a3=<indexCount>

After 2 unknown lines, there is info about a specific theme its in TSV Format

Column No	Notes
1	Theme list ID used in this request https://npdl.cdn.nintendowifi.net/p01/nsa/dMtiFHzm5OOf0y2O/thmdtls/<countryCode>/<language>/<ThemeID>
2	Price in the local currency (in free themes, this column is empty)
3	Same as column 1
4	?
5	Themes List Index Count
6	?
7	Timestamp when the Theme was added

Theme List Format

The Table list is incomplete. Research is in progress.

The Theme List format, used to display available themes in the category chosen by the top section or the new themes section, is stored at https://npdl.cdn.nintendowifi.net/p01/nsa/dMtiFHzm5OOf0y2O/thmlist/<CountryCode>/<Language>/<thmListId>.

Decrypting the Theme List BOSS file using GodMode9 or Decrypt9WIP contains the following data

Offset	Description
0x0	File magic (boss)
0x9	File size (in bytes)
0x2D4	Title of the theme category (UTF-16)
0x394	Developer of the theme category (UTF-16)