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Originally Posted by Purple Lady

After you update you usually need to root again. Use whatever method you used before to root, and then SuperSu should work properly or the binaries should update properly.

Apparently you were right : although Rootchecker would notify my device as already rooted, I used KeyRootMaster anew and it solved the problem.

Couldn't go through the former method though : using the Toolkit batch would return "adb server is out of date killing daemon started successfully" and I couldn't find any solution to that for "minimal" version of adb.

So I just pasted "Root_Master_1.3.6_Cekas_FIX.apk" from the Toolkit folder to my device and installed it. You have to insist a bit : the installer would first block it, but you can "install anyway". That made it.

Thanks again, both of you : you keep saving my life ^^