If you manage to find a way to unlock your bootloader (rarely possible through paid third-party exploits), the Project Treble . This means you wouldn't look for a " Nokia G300 ROM," but rather a Generic System Image (GSI) Compatibility: You would need an Where to look: Treble ROMs GitHub is the primary source for these images. 3. Alternative: Debloating (No Root Required)
If you were looking for a custom ROM for the Nokia G300 in 2021, you likely encountered a significant hardware and software barrier. nokia g300 custom rom 2021
If you manage to unlock the bootloader through unofficial means, your only option for a custom experience is a : If you manage to find a way to