How to silently change git history?

Question

git

There are 2 branches, master & dev, and 2 users A & B
example:

master -> A1 - B1 - A2 - A3
                 \
dev    ->         B2 - A4

Is it possible to change the A1 commit so that the master & dev branch would not be overwritten, but the changes were in A3 and A4 as well?

Answer 1

so that the master & dev branch is not overwritten

no. after all, this is what git was created for