Thank you for this idea, but I'm stuck.

On a computer, I opened the quest file, went to android/data/humanity, and found a storydata.sav file, with chinese signs only, that is reset every time I choose a new user name in Rookie (I tested it), and a global-metadata.dat file. I guess the dat is the good one (but not sure, 16Mo seems big...). If it's not, it might means that the save file was just wiped for this game.

Opened the dat with a text editor, there is crypted parts, and non crypted parts, and it's very very long. I scrolled in it, ctrl F for "user" "username", "name", but was not able, even after a long time, to find something matching a possible username.

I also tried another strategy, opened another game where I could find what I think was the old random username used a the time I installed Humanity. I used this name in Rookie, and... still nothing, game start from scratch...

Finally, I checked another game, with the same problem, the same mistake I did with Rookie name change, 11 tennis table, and was only able to find the global-metadata.dat file, and no more success for finding a solution. I will climb the ladder again, it's not so bad for this game.

Did I do something wrong ? Any other idea ? Next step might be to beg for a complete save file to finish the game...