Ensure your phone has at least 60% battery life to prevent unexpected shutdowns.
The first boot may take up to 5–10 minutes. Do not interrupt the process. Troubleshooting Common Issues galaxy a01 custom rom
Check out a visual walkthrough of installing modern firmware on older Samsung hardware via specific model number of the A01 you have to see if its bootloader is unlockable Ensure your phone has at least 60% battery