If you find a file, check the version number. Never downgrade from R022 to R019. Never flash a file labeled "V500R019C00SPC..." unless you are 100% sure it matches your hardware revision (check the sticker on the back of the ONT).
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Downloading and updating firmware for the Huawei EchoLife HG8245W5 Huawei Echolife Hg8245w5 Firmware Download - Google
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