Because official sources like LumiaFirmware have gone offline or lack specific files for the 650 Dual SIM, the community relies on third-party archives:
Lumia 650 "emergency files" are specialized firmware components—specifically lumia 650 emergency files exclusive
guides/WIP-NewGuide.md at master · WOA-Project ... - GitHub lumia 650 emergency files exclusive
A well-known repository for various Lumia models is available at Proto Beta Test . lumia 650 emergency files exclusive
A) Obtain correct FFU: