Flashing software updates the OS, not the SIM lock. You need an unlock code for network unlocking.
: Always look for files containing "AllLang" or "Multilanguage" to ensure all language packs are included. How to Flash Your BlackBerry 9790 blackberry 9790 flash file updated
Major releases like OS 7.1.0.523 were common for carriers like Telkomsel and Rogers. Flashing software updates the OS, not the SIM lock