retrofit

To supply (a device, structure, etc.) with new components or parts that were not previously available or installed; to modernize.

To add or substitute (new components or parts) that were not previously available for or installed in a device, structure, etc.

To supply a device, structure, etc., with new components or parts that were not previously available or installed.

(figurative) To give new characteristics or make alterations (to someone or something) to suit them to changed circumstances.

Synonym of backport (“to retroactively supply a fix or feature to a previous version of a software product at the same time or after supplying it to the current version.”).

An act of supplying a device, structure, etc., with new components or parts that were not previously available or installed; a retrofitting.

A change made to a device, structure, etc., by introducing components or parts that were not previously available or installed.