Can't restore phone after it was stolen

Hi guys, friends phone (Huawei Y6) was stolen, but they found the guys about 30mins later and he got the phone back.
The Google account activity website even said the accounts password was changed, I wonder how. The phone
was locked with a non-common pattern.

Anyway, he tried to login with his Google-account-credentials and got an error. Then we did reset the account-password
by using the non-google recovery-mail since calling the phone or SMS doesn't work without unlocking. But the
phone still declines a login with these credentials and says we should use an account that was used on this phone already.
Last thing we tried was to again factory-reset the phone, ofcourse didn't help either.

So, any way to overcome that security-feature?

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