backfit

[bak-fit]
verb (used with object), back·fit or back·fit·ted, back·fit·ting.
  1. to update by providing new or improved equipment or features: a five-year program of installing new power plants and backfitting existing ones.

Origin of backfit

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018