Need Huawei Mediapad S7-721u Board Software

Hello
I have bricked S7-721u by flashing update.app
now stuck in qualcomm mode
i cant find board softwares in Boot-loader.com

When Repairing with update.app
sigma says:

Code:

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--------- 2018-12-06 18:30:14 ---------
SigmaKey 2.29.12b1 Qcom: Write firmware
Firmware file does not match the phone

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