here’s a link to the update:
DH_VTHX421L_MultiLang_SIP_V4.500.0000001.0.R.210714
and there’s another one if you go to the product page:
DH_VTHX421H_MultiLang_SIP_V4.500.0000002.0.R.210713
I think the first link is the latest firmware IMO.
There’s no micro sd slot but I’m sure it comes with an SD card because it allows you to record and leave messages, and the specs say that you can upgrade it to 32G.
DH_VTHX421L_MultiLang_SIP_V4.500.0000001.0.R.210714
undefined - Dahua Technology
www.dahuasecurity.com
and there’s another one if you go to the product page:
DH_VTHX421H_MultiLang_SIP_V4.500.0000002.0.R.210713
I think the first link is the latest firmware IMO.
There’s no micro sd slot but I’m sure it comes with an SD card because it allows you to record and leave messages, and the specs say that you can upgrade it to 32G.