I am trying to upgrade a ipb 3.3.4 board using the 2.3.5 diff file (because that forum is moded, I can not just replace with the upgrade pack), but I found that in the diff file the 2.3.4 codes are marked with "+++" but the 2.3.5 codes are marked with "---". There are errors reported when I use the SVN to merge.
Maybe that is the 2.3.5 -> 2.3.4 diff pack by mistake. So is that file wrong ?

We do our best to provide the diff report, but can't really support.

I did an SVN diff, and then removed a bunch of nonsense (i.e. we moved our ips_kernel into a separate repo and use svn:externals to pull it in, but because of this SVN saw every single file in ips_kernel as changed and the diff report was some 12MB in size). It's not the --- vs +++ (that's added vs removed code and *should* be correct...let me know if you think it's not) but probably some character mistake I made in removing the excess stuff.