This is highly technical. If you are not comfortable, consider buying a new replacement ONT instead.
If you are simply looking to improve stability, target version V500R019C20SPC135 . If you want to unlock bridge mode and root access, search for HG8145v5_V500R019C00SPC108B039_unlocked.bin . Firmware Huawei Hg8145v5
Updating the firmware of your Huawei Hg8145v5 is a relatively straightforward process: This is highly technical
– Typically .bin files, flashed via: