Ensure the battery is at least 50% charged to avoid a shutdown mid-process.
One of the users had shared a link to the RM-604 flash file, specifically designed for the Nokia 7230. The file contained the phone's firmware, which could be used to restore the device to its factory settings. nokia 7230 rm 604 flash file
Open your flashing tool (e.g., Nokia BEST). In the settings, point the "DataPackage path" to the folder containing your "RM-604" firmware folder. Ensure the battery is at least 50% charged
Check your device manager for "Nokia USB Flashing" drivers. Reinstall drivers if necessary. Conclusion Nokia BEST). In the settings