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TG-400 System Got Crashed after firmware upgrade

I am using this product "yeastar TG400", I was select the wrong firmware version to upgrade my device and proceed for an upgrade, 

currently, the device is not accessible on its default IP address '192.168.5.150'. Device system it got crash while upgrade.

on the device, the front panels all led light turn on.  (Refer attached screenshot)

 

as per your suggestion device should accessible upgrade the device. let me know how to do i access device dashboard after a crash.

is there any way I can flash stock firmware in this scenario.

 

This is very important for us, the device should get the live and working condition.

 

Your Support is highly appreciated.

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