According to the following article, you have to contact the Huawei Customer Service Centre:
https://www.huaweiupdate.com/you-can-no...
In Switzerland there is a Huawei Service Centre (Glattfelden), I assume that a support case must be opened and then the device must be sent in at the request of support.
The same thing is happening to me now, I will gladly record the experience here as soon as I know more.