how to repair th rubber boot & fiter on 1990 BMW 525i

i have a 1989 BMW 525I AND need to repair th rubber boot & filter that go to th intake and need step by step directions.

Asked by for the 1990 BMW 525i
your description is unclear. there is a rubber intake boot to the air mass meter. it's about $30 and the rubber is likely brittle and dry rotted; how would you repair it?