This means that "Firmware Version 1.01" from one provider might look and behave very differently from "Firmware Version 1.01" from another.
Use serial console recovery (requires soldering UART headers). Search for “HG531 V1 UART pinout” – you can flash bootloader via tftp with serial intervention. For most home users, this means buying a new router. Hg531 V1 Firmware
Before downloading any file, you must identify your precise hardware revision. The “V1” in HG531 V1 indicates the first hardware iteration. However, many ISPs (such as China Telecom, Telkom, or Deutsche Telekom) use custom firmware builds. This means that "Firmware Version 1