You can read all details at this site with a link to an English translation of the report at the end of it. Bottom line, they knew about a flock of birds before takeoff, didn't retract the gear after the engine failure/damage, were prevented from stalling the aircraft(full backstick) by the high AoA protection, and selected the gear up when they were about to land in the field.
Russia’s Potemkin Miracle: The story of Ural Airlines flight 178 | by Admiral Cloudberg | Medium