Q: Can I downgrade to an older stock ROM version? A: Yes, but it's not recommended, as downgrading may cause issues with your device's software and hardware.
Q: Will flashing a stock ROM void my warranty? A: No, flashing a stock ROM on your Galaxy A20 SM-A205F DS will not void its warranty. Official Samsung Galaxy A20 SM-A205F DS Stock Rom
To install the official stock ROM on your Galaxy A20 SM-A205F DS, you'll need to use the Odin flashing tool. Here's a step-by-step guide: Q: Can I downgrade to an older stock ROM version