Some mobile operators marketed 3G HSPA+ technology (which the E173 supports in some variants) as "4G" before LTE became the global standard.
No amount of hacking, flashing, or "unlocking" will add 4G capability. Unlocking only removes carrier restrictions (e.g., using a T-Mobile dongle on Vodafone) – it does not change the hardware standard. huawei e173 support 4g