CWM for unsupported device but with same specs
When unofficially modifying your phone, nothing is safe... But if others say it worked, give it a shot.  Just keep in mind that anything can go wrong, so back up your data and have a Plan B for recovering your system.

Edit:  Plan B (how to recover your phone):

Recovery Software:  http://www.archos.com/faq/index.php?action=artikel&amp;cat=120&amp;id=301

Stock ROM:  http://update.archos.com/AFMv1/storage//files/full/a40ti/20130922.101129/OTA972121_8916_V007049.zip