Never trust a random “MC7010 firmware.bin” file from a file-sharing site without MD5 verification.
If you updated the firmware and now your SIM card isn't recognized, the update may have re-locked the device to a specific carrier. You may need to contact your ISP or search for "unlocking" solutions specific to the new firmware version. Zte Mc7010 Firmware Update
In the enthusiast community, there are "unlocked" firmware versions for the ZTE MC7010 that claim to open up band locking features (allowing you to manually select 5G bands). Never trust a random “MC7010 firmware
: Resolving common glitches that cause unexpected reboots or connection drops. Zte Mc7010 Firmware Update
(Invoking related search suggestions.)