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: For older units, firmware must be updated in stages. A common stable "milestone" is v2.0.4 build 181027 , after which standard procedures can be followed.
There is a prevailing myth that "you must always run the latest firmware." In access control, this is false. Do not update if: ds-k2604t firmware
Do not install early V2.1.x builds if you are using iSC (Hikvision’s integrated software). There is a known memory leak in the event push service that requires a weekly reboot. If you are currently on that, upgrade immediately. : For older units, firmware must be updated in stages
: Upgrading directly via iVMS-4200 can cause hardware rejection, rendering the unit unusable. : For older units