Get from the support area:

Victoria-L09B_C440B112_Firmware_United Kingdom_Nonspecific_Android7.0_EMUI5.1.zip
Victoria-L09B_C440B112_Firmware_United Kingdom_Nonspecific_Android7.0_EMUI5.1.z01

1.Try flash customization app update_VTR-L09_ee_gb.app only at first
2.Change the Vendor to ee and the country to gb (both are case sensitive)
If not enough, then write whole flash (UPDATE.APP from the archive above).This guide is valid for the file above only.

 

NOTE: Resurrector module must be activated for this operation !