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Rooted but su says "Permission denied"

I have this “old” Lenovo A2107 tablet that I rooted many years ago (using the download from http://androidforums.com/threads/a2107-root-mods-and-rom-discussion.661261/ , running my root. bat script from my GNU / Linux machine) and it worked perfectly.

Then I passed this pill to my daughter for a couple of years, and now I got it back.

/ system / bin / su is still present, still the same date and size, the stationary mode is "rwsr-sr-x", still the same firmware (Android 4.0.3), so everything looks fine, but when I try to run it from the shell, it just tells me "Permission denied".

Any idea what could be? What could I try to track?

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OK, for those who are interested in learning, I realized what it was: the program / system / bin / su either accepts the request as is (depending on who is asking), or passes the request to some other program (Superuser. APK )

As it turned out, I still have / system / bin / su, but Superuser.apk is missing. Fortunately, / system / bin / su did a great job with the "adb shell", although when using ConnectBot and other terminal emulators, it said "Permission denied". So I used the "adb shell" to gain root access and manually copy Superuser.apk to / system / apps.

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Magisk .

, Oneplus 5 (Oxygen OS, Nougat) Magisk Manager, (com.android.sheel), adb su.

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FWIW... ( "su" ADB " " ), .

Galaxy Nexus CyanogenMod.

, ""; ( ), " ", " ". " ADB", ADB, "su".: -)

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