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Yeastar TG800. Problems with PCS1900 band.

Hello.

I have two TG800, and the problem is one of them don't recognize the SIM of CLARO. In Trunk Status say: 

Unregistered Network

The TG800 work's fine have the firmware 55.18.0.40, and the TG800 with the problem have the firmware 55.18.0.46.

Claro use the frecuency PCS1900

Can anyone help me, or give me the firmware 55.18.0.40 for a downgrade.

Thanks.

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