Upgrading, are all files changed?

[eeeee]

Im running a recent 2.5.3 version of NodeBB, and I made a couple of changes to the source files.
If I do the upgrade to 2.5.7 will definitely my changes be lost and I will have to recode those, or are only new src files downloaded that include changes?

[PitaJ]

Depends on how you perform the upgrade. I'd recommend backing up what you have and just try

git stash
git pull
git stash apply

It should probably just work, but you may get "merge conflicts" that you'll have to resolve.