The Quanta 5 firmware upgrade has a following specific: it is necessary to check the compliance of the frequencies used with the regulatory domain restrictions, which appear in version 2.0.0. In the automatic center frequency selection mode, in case the frequency grid is wider than the range allowed by the regulatory domain, this will be detected immediately after the upgrade, as a result the link will remain in the "Init" state. To restore the connection, manually correct the configuration by narrowing the frequency grid or changing the regulatory domain.
In order to establish the link, make sure the firmware version is the same on the both devices.
To upgrade to version 2.0.0 or higher without the loss of the communication, use the following methods.