Because Kiloo/Sybo now erncrypt all files in the SubwaySurfers app, it's harder to publish the files for the characters and boards-
You can still download all files and put them in the right folder and it will work, SubwaySurfers makes it just easy enough and encrypts those files when they are in the folder, so there changes nothing in this
You can also use an old versions of the app, right now I found v2.39.0 best working and the files will not be encrypted, the downside there is that the SeasonHunt will say that you need to udate your app and you dont get new Characters
Insight how I did it test
For these Versions I tried to find the right name for the characters and boards and write the json code directly in the old files instead of taking it directly out of the game folder
Found out you can use and edit all files so they have no commas in them (exept the one after "version": 3) and it still works somehow ... Still gonna use with commas because why not
App Version: v3.5.0
Season Hunt: 0060
Add every Character and Board that has existed in the game
Android/data/com.kiloo.subwaysurf/files/profile/user_stats.json
Highscore DefaultValue:100000000
Android/data/com.kiloo.subwaysurf/files/profile/top_run.json
CurrentScore DefaultValue:100000000
Android/data/com.kiloo.subwaysurf/files/profile/wallet.json
3 Boards DefaultValue:100000000
2 Keys DefaultValue:100000000
1 Coins DefaultValue:100000000
5 Shop:Score Booster DefaultValue:100000000
6 EventCoins DefaultValue:100000000
4 Shop:Headstart DefaultValue:100000000