If you’re still searching for Huawei Union Y538 official firmware, here ends your search.
This firmware has been tested and found to be working flawlessly. So, if you have any problems flashing the package, post in comments section for additional support.
Huawei Union Y538 firmware – Download
How to flash Huawei Y538 ROM
Follow flashing instructions here https://www.leakite.com/2016/07/how-to-flash-huawei-updateapp-stock.html