Firmware downgrade

Dear community,

I hope you can help as i have submitted numerous tickets to yeastar with no response whatsoever. I recently upgraded a U100 from  to which i downloaded from  http://www.yeastar.com/Downloads/IP-Phone-System-Firmware . This upgrade however made it impossible to create trunks and did not recognize my TA410 gateways so i decided to downgrade. So looking around i could not find any link to download firmware i went with the to downgrade but it stays stuck in

*I upgraded the firmware in the first place because TA410 gateways were recognized but were not configurable from the TA provisioning menu.

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