Got a bug report about an app I did nothing about (used by some partners to check certain kinds of tickets). No one else knew anything about it. I couldn't find

Got a bug report about an app I did nothing about (used by some partners to check certain kinds of tickets). No one else knew anything about it. I couldn't find it on our Gitlab nor in our legacy Bitbucket. Turns out the source code was lost a long time ago, but a partner still had the APKs (there were two versions, one in English and another slightly more advanced in Italian). Using APKTool I managed to decompile the app, add some printf logging to figure out the issue, fix it in the Italian/more advanced one, merge it with the English one and rebuild it. The only issue is that the signing key was lost too, so partners had to uninstall and reinstall, but nothing I could do about it. Oh, and another time I cracked the in-app purchase for the password manager I was using on a spare Android device while my Lumia was in RMA (it had separate purchases for each platform). Of course I bought it once I let go of Windows Phone and moved to Android permanently.