6:21 AM PT -- Soulja Boy was released from jail after posting $35k bail Thursday night around 11 PM. We're told he had been booked for felony possession of an assault weapon.
Soulja Boy's on his way to an LAPD jail cell after getting arrested in his Hollywood Hills home.
Officers walked him out of the North Hollywood station, in handcuffs, to a patrol unit, waiting to transfer him to the lockup in Van Nuys.
TMZ broke the story ... Soulja Boy got busted for violating his probation when cops found at least one gun in his crib.
We're told he's being held without bail.