The Infinix Global Firmware, that you find and download from here in this guideline are not different from the ROM,s that you get as over from air updates. The only difference is that you are flashing the firmware files manually with yourself whereas an automatic OTA update would you can download the Infinix S3(X573 & X573B Firmware) “Infinix Firmware download” Stock Rom files by using the internet connection.
INFINIX X573B-ql 1668A-O-IN-190528V45 free newfirmwares.com
