Não obti respostas aqui, mas procurei mais na internet e achei esse tutorial, em Inglês :
Using the VIO youtube video upgrade to 2.3.6 content as described......
- Make Odin ready with the rom in PDA as video describes.
- connect tablet to computer while off and imidiatly hold down Vol Down and power button as if trying to get into Download mode, tablet will not light or show anything in screen up but computer will make USB detected sound... then press start in Odin......... it will flash the rom " P1000XWJQ8_P1000AUTJQ1_P1000XXJPZ_HOME.tar ".... follow the steps as described in VIO video EXEPT! do not let the tablet boot into android as the VIO guy says, turn it off and enter download mode and flash the 2nd file called " dbdata " and then follow his steps..... this is what i think prevented me from getting boot loop issue again................
i upgraded to the 4.1.2 by VIO also and the tablet works super! now....
i posted this to help others with THIS problem................. cheers.''
Crédito do tutorial ao BMN2205 do XDA
Resolveu o meu problema, pode ser que resolva o de mais alguém !