Samsung tablet stick on " Downloading do not turn off target" screen

I can't get off this frozen screen with any of the suggested button manipulations ( Power, Home, Volume Up or Down) to boot back to my tablet. The tablet starts booting back, but it reverts to the downloading screen immediately after, in a loop.
I was about to install a custom ROM.

I downloaded the Flashify app and followed the instructions to flash the TWRP on the tablet from the file on the SD card . This problem started.Immediately after.

Mine is a Samsung SM-T330 tablet.

Thanks for your help

Franco V.

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