(like official LineageOS or Pixel Experience builds) specifically optimized for the Nokia G300 GSI (Generic System Image) : Because the supports Project Treble, your best bet is likely a GSI
Some unlocking methods require putting the phone into Emergency Download (EDL) mode by shorting motherboard pads—only attempt this if you are comfortable with hardware disassembly. Ensure you have the latest Android USB Drivers installed on your PC.
Here’s a balanced, user-focused review of the custom ROM scene for the , as of 2026.