annke's support team sent me the firmware a year ago, and it says that they fit I91BM_I91BN_I91BL_8mp_5.7.1_230627The difference is that it is FW for annke and no resolution is lost, not even the HIK logo. I don't know why for his C800 (I91DS) it is available and for (I91DL) it is not
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