There is no simple way to revert your repository to a previous revision on Assembla. However, a reversion is possible by following these steps.
First, export the SVN repository in your space. This can be done under the Import/Export section of your repository. It’ll take a minute for the dump to be created. Once that has completed, download the repository dump.
Then, extract the contents of the ZIP file to a temporary directory, then run the following commands in the temporary directory:
svnadmin create REPO_NAME svnadmin load REPO_NAME < rXX.dump svnadmin dump -r 1:YY REPO_NAME --incremental > rYY.dump gzip rYY.dump
XX with the current revision of your repository,
YY with the revision you wish to revert to, and
REPO_NAME with any name, such as your repository’s name. This name will not be carried over later.
Afterwards, delete the repository tool on Assembla by going to Admin -> Tools, then clicking Delete next to it which is located on the right. Now re-add the Source/SVN repository tool.
Finally, import the dump to the newly created repository by going to the Import/Export section and uploading the gzipped SVN dump. The process will take from a few to several minutes depending on how large your repository is.
Your repository should now be reverted back to the revision you specified.