This sentence you wrote can´t be more unexact for the purpose we have here.
I highly recomend you to read and also understand how the glich attack is achieved on tegra x1 before advise each other here.
improve that, that´s the cause of your long glitchings time
you need to do it this way in order to have instant boot. A good ground points also helps. Clean as much as possible
Best regards
