3637577 - Support for custom themes based on Belize Themes

The Belize theme has been deprecated since SAPUI5 version 1.120. As of SAPUI5 version 1.135, the Belize theme has reached its end-of-life and is no longer supported for SAPUI5 applications.
For more details, refer to the documentation on Supported Combinations of Themes and Libraries and the announcements Removal of Belize Theme of SAP Fiori and Upcoming Removal of SAP Fiori Themes Belize and Blue Crystal.

Queries:

1. If SAP UI5 version <= 1.136, will SAP continue to support the custom themes based on Belize themes?
2. If SAP UI5 version is not updated to latest version, what will be the impact on the system?
3. If SAP UI5 version <= 1.136, Is it possible to perform the migration of the custom theme based on Belize to any other theme?

Note: The above queries are applicable both on premise and cloud solutions.

UI Theme Designer Service for both On premise and Cloud Solutions.

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