The primary barrier to custom ROM development for this device is its locked bootloader

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The Nokia G300 is a capable piece of hardware held back by locked software. While the path to a custom ROM is fraught with danger—blown efuses, broken sensors, and bootloops—the reward is a phone that outlasts its commercial support. For now, stick to debloated stock ROMs unless you are fearless with a command line.

This is the hardest part. Unlike Xiaomi or OnePlus, Nokia does not provide an easy unlock method. You may need to use third-party unlocking services (like MTK Client tools if applicable, though Go to product viewer dialog for this item.

Unlocking the bootloader requires an official unlock token from HMD (still free, but takes ~2 weeks). No exploits – it’s legit but tedious. Once unlocked, TWRP is unofficial but functional. Expect to spend 1–2 hours your first time.