While all of the OEM Hikvision DB2 video doorbells are identical hard ware wise it appears that issues have been reported with the RCA labeled video doorbells.
Two RCA users on the IPCamTalk forum have reported that they have bricked their doorbell cameras updating them with newer firmware.
It could also be related to a corrupt firmware image download.
My Nelly's security version is doing fine these days.
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