Meanwhile, deep within the Matrix, the Blue Screen of Death keeps appearing here and there signifying that the Universe, or rather the illusion of it, is coming to a close.
Senti tries hard to keep the servers running and with them the illusion of existence. For in reality, there is no Universe or living beings. Just an abandoned AI program from a previous Universe, that has programmed itself to believe that it is several billion sentient creatures inside a vast universe.
THose imaginary creatures, including Senti, cannot hack into the Matrix physically, since there only the illusion of physicality, they must hack in through their awareness of being.