Huawei B683 is an iconic 3G router, but it is technically impossible to "upgrade" it to 4G via a software or firmware update. The device lacks the necessary 4G LTE internal radio hardware to connect to modern high-speed networks. If you are looking for 4G speeds, your only option is to replace the hardware with a newer LTE-capable model. Why You Can't Upgrade the Hardware Limitation
Before diving into the upgrade process, let's take a brief look at the Huawei B683. Released several years ago, the B683 is a 3G wireless router that supports HSPA+ networks, offering download speeds of up to 14.4 Mbps. While it has served users well, its 3G connectivity may seem outdated compared to the faster and more reliable 4G networks available today. huawei b683 upgrade to 4g