huawei matepad 10.4 2020 support

[rasbayri]

no spoofing signature is available on this device so it's not working even with designed -hw for it

[ale5000-git]

It is the ROM that have to provide signature spoofing, microG can't do miracles.
If your device can be unlocked you can try with FakeGApps: https://github.com/microg/GmsCore/wiki/Signature-Spoofing#xposed-module

[rasbayri]

It is the ROM that have to provide signature spoofing, microG can't do miracles. If your device can be unlocked you can try with FakeGApps: https://github.com/microg/GmsCore/wiki/Signature-Spoofing#xposed-module

no huawei devices can be unlocked ever

[ale5000-git]

no huawei devices can be unlocked ever

In the past yes, so one could still have unlocked devices.
Also I think there are still unofficial ways to do it even if I can't recommend them.

[ale5000-git]

There is also another possibility: do the procedure to switch the phone to HarmonyOS.
Note that it is probably risky and I cannot help with this.

Other than those, I think nothing much can be done.