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Onvif on hik camera protect by user and password you set on camera !

Maybe ip camera not active you use iVMS 4200 or bachtool find and active it !

You can change port (dont default port) set password account admin (not empty password) , maybe fix it !

you find uart port on board and board usb to uart. Download firmware comfotable .Recovery via uboot

You changed config in firmware ( mod firmware ) ? You can use usb boot-up to recovery fw . Fimrware you find xiongmaitech website. ( auconfig.txt and update.img) Or you can recovery by UART port !

Your rom backup only uboot if your board only ic rom 25Fl128 you cant recovery because you lost serial id (3fc00 to 40000).

On XM board have 2 ic rom (24c08 and 25FL128). 24c08 with serial id + mac address, 25FL128 is OS. If board have 2 rom you can flash uboot ( flash tool xeltek ) and then flash all by TFTP. Your NVR is recovery (not lost ID + chanel number). If board only 1 rom 25FL128 you find and backup address...

i have a nvr board use Hi3536D chip all schematic same NBD8008 xiongmai hardware. I try flash uboot and then flash fw via UART, nvr boot up and run but only 1 frame and serial and mac is default. Maybe i lost rom chip 24c08 ( mac + serial ) or it include master rom ( address 3FC00 to 40000) can...

can you share me backup rom hex. i unbrick my nvr i lose uboot