Instead of changing the firmware, you can use third-party desktop and mobile applications that utilize Huawei's built-in developer API. Tools like (for Windows) or Huawei Manager (HManager) (for Android) allow you to:
If you can tell me the (e.g., Cxxx...) and the ISP the router is locked to, I can help you find more specific advice on whether that model is flashable. huawei b535232 custom firmware link
Disclaimer: Flashing custom firmware carries a risk of permanently bricking your router. Proceed at your own risk. This process usually requires opening the router casing to access hardware test points. Prerequisites A Windows PC with a LAN port. Instead of changing the firmware, you can use
Locate the pin on the motherboard (usually a small gold pad near the flash chip). Proceed at your own risk
Short the Testpoint to the ground (shielding metal) using tweezers while plugging in the power supply.