As of 2026, there are no official or stable device-specific custom ROMs
The Nokia G300 (and most modern Nokia devices) comes with a locked bootloader that cannot be officially unlocked. Without an unlocked bootloader, you cannot flash custom recovery (like TWRP) or custom ROMs. nokia g300 custom rom 2021
for most of its models, which is the essential first step for any custom ROM installation. As of 2026, there are no official or
Generic System Images (GSIs): If you manage to unlock the bootloader, the G300 supports "Project Treble," meaning it could theoretically run a GSI (like a generic build of Android 13 or 14). This is highly technical and prone to bugs like broken cameras or missing 5G support. LineageOS AOSP (Android Open Source Project) Evolution X