About the warranty you can send your SN number to our sale team This email address is being protected from spambots. You need JavaScript enabled to view it. for checking , The older firmware version you can get here
www.openvox.cn/pub/firmwares/GSM%20Gateway/releases/
There is no firmware version 2.4.6 on this resource. My backup configuration file is not suitable for other versions. When upgrading from version 2.4.6 to version 2.5.4, something was converted incorrectly.
Problems are coming I want to return to a specific firmware 2.4.6 and restore my backup