IPC-T5442TM-AS , IPC-T5442T-ZE Latest new Firmware Volt V2.800.0000000.17.R.200620

Yes exactly there. Browse to the upgrade file and then upgrade.
I tried to upgrade my camera exactly this way , the transmitting files window appeared and nothing happened when I had selected the firmware bin file and I had clicked upgrade button for this reason I questioned my problem here.
 
Chrome with the IE plug-in might work as well.
 
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