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hi, i have a hikvision ds-2cd2112-i camera baseline firmware is 5.0.2 build 130805 last time and upgrad to 5.3.0 and it crash SADP can't find camera, only tftpd server(192.0.0.128 IP PC), i try downgrade to 5.0.2 5.1.6 5.2.0 I tried but it did not help when I run tftpd server i can telent to...