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nonameuser Is it possible to get infected more seriously then just software? I mean that boot loader is infected bcs of that
I don't know the answer for sure, but I would say yes. If the app is sophisticated enough it could hack your whole system (escalated privilege). @matchboxbananasynergy might be able to answer better.
nonameuser Getting these kinds of apps that have their source code edited and republished by unknown third parties is VERY dangerous and definitely the publisher could have inserted malicious code in the APK. So you have to decide if you really trust the APK. What you are doing is treading on the MOST risky of grounds. It don't get much more unsafe, so.