Yes. Writing incorrect data to the modem partition can cause complete loss of baseband (no signal forever). Always backup first.
If you own a Huawei phone with a broken IMEI, the ethical and safe story ends in one of three ways: huawei imei repair tool free
While the tool itself is often downloadable for free, it requires the original Database file (NVram) from your specific device model. If you do not have a backup of this file, the tool cannot restore the original numbers. Changing them to random numbers is technically illegal in many jurisdictions and difficult to do correctly with MAUI Meta without deep technical knowledge. huawei imei repair tool free