Search Russian-language forums like 4PDA (4pda.to) for the most stable stock firmware versions ( .bin or .img files).
Fly IQ454 EVO Tech 1 stock firmware download or прошивка Fly IQ454 EVO Tech 1 официальная Important Notes for Flashing skachat proshivku na fly iq454
Ensure you back up all personal data before starting. Battery: Make sure your phone has at least 50-60% battery. Search Russian-language forums like 4PDA (4pda