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Hi, It seems that PL2303 was faulty. Ordered a different USB to RS232 TTL. After replacing PL2303 with CH340 all data received from DVR was OK. Breaking into boot loop with Ctrl+u and firmware flashing went smooth... Finally... As a bonus, I also revived a Hikvision DS-KV8102-IM TCP/IP outdoor...

Hi, Thanks for the reply. I have connected the onboard 4 pin header. The USB to RS232 TTL is a PL2303. I'll try to find a MAX232 based converter (level converter), so I'll be able to use a standard RS232 PC port. Back to file I attached, it made sense to me that once some of the strings are...

Hi guys, I would appreciate an advice about a firmware update that went wrong. After update, the DVR goes into a boot loop. I tried to connect with RS232 TTL but I cannot stop the boot sequence with CTRL+u. I attached the log from Putty. Please help me to recover the DVR. Thank you.