Upgrade FW HT 502 from to



Hi, I have a HT 502 fw version and I want to upgrade this device to the last version available (currently


I understand that I cannot upgrade this ata directly to the last version, but I need to follow a specific order using old firmware versions.

Unfortunately, this ata is now an end of life product and Grandstream is not providing any kind of support.
Is there anyone who still have the old firmware versions that i need and could send them to me?

Thank you


Just for posterity’s sake, I want to add that I managed to upgrade my HT502 by following these threads: