I have deleted this answer as i am not sure this Texas Instruments (TI) OMAP 4430 SoC is shipped with fastboot mode at all. Ususally Samsung devices have Odin Download mode, please follow this instructions instead  
https://twrp.me/samsung/samsunggalaxytab2gmsunified.html


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(old answer still can be viewed [here][1])


  [1]: https://android.stackexchange.com/revisions/210515/4