"Serious software issue detected"

Serious software issue detected” usually means your phone’s operating system is corrupted, stuck in a boot loop, or a critical system app failed after an update, crash, or malware. First, restart the phone. If it keeps appearing, boot into Safe Mode and uninstall recently installed apps. Next, check for system updates and install them. If that fails, back up your data and perform a factory reset from recovery mode. If the error appears even after a reset, the firmware may be damaged and needs a reinstall via official service software. In that case, visiting an authorized service center is the safest fix.