What firmware updates do and why they matter
Using "unauthorized" firmware found on forums can void your ISP warranty or support agreement. dg8245w2 firmware update link
Once you have downloaded the correct .bin or .zip firmware file from an official source, follow these steps to install it: What firmware updates do and why they matter
https://techpatch.org/huawei/dg8245w2/ Contains latest V5R021C00S130 (universal GPON) + checksum MD5. dg8245w2 firmware update link