Tron was presumably derezzed and Flynn was pressured to flee in to the Outlands when the ISO's were destroyed, an party known as the Purge. The portal - the only way out from the Grid - observed the top of its millicycle window (8 several hours while in the Grid; https://josueurmhc.bloguetechno.com/5-easy-facts-about-generate-vanity-ethereum-address-code-described-62433955