Hi
Thanks for your answeer.
I used towelroot (tr1.apk) to install at first a basic "su" program, then I retrieved the supersu.apk, installed it normally, it asked me then to update the "su" program and finally I got supersu working with the device root surviving each reboot.
Still, I do not know if it will survive each android update, but at least this procedure should work again.
Best regards
deb2016
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