alastair@PC-I5 ~/cctv/NVRFirmware/3.4.84/DVR_K56_K55_K57_OVERSEAS_ML_STD_V3.4.84_Build170626 $ ll
total 132880
drwxr-xr-x 5 alastair alastair 4096 Sep 23 2017 ./
drwxr-xr-x 3 alastair alastair 4096 Sep 23 2017 ../
-rw-r--r-- 1 alastair alastair 45340160 Jun 27 2017 digicap.dav
-rw-r--r-- 1 alastair alastair 45339560 Sep 23 2017 DVR_K56_K55_K57_OVERSEAS_ML_STD_V3.4.84_Build170626.zip
-rw-r--r-- 1 alastair alastair 14651904 Sep 23 2017 FWpart1
-rw-r--r-- 1 alastair alastair 14656000 Sep 23 2017 FWpart2
-rw-r--r-- 1 alastair alastair 16032256 Sep 23 2017 FWpart3
drwxr-xr-x 2 alastair alastair 4096 Oct 3 2017 part1/
drwxr-xr-x 2 alastair alastair 4096 Sep 23 2017 part2/
drwxr-xr-x 2 alastair alastair 4096 Sep 23 2017 part3/
-rw-r--r-- 1 alastair alastair 139 Sep 23 2017 split.txt
alastair@PC-I5 ~/cctv/NVRFirmware/3.4.84/DVR_K56_K55_K57_OVERSEAS_ML_STD_V3.4.84_Build170626 $ hikpack_2.5 -t k41 -i digicap.dav
Magic : 484b5753
hdr_crc : 00001cad (OK)
lang_id : 00000001
date_hex: 20150315
devclass: 00000044
File: cramfs.img, CRC OK
WARN: missing new_20.bin trailer file
Extra tail at the end of dav, 30688256 bytes, maybe firmware id?
alastair@PC-I5 ~/cctv/NVRFirmware/3.4.84/DVR_K56_K55_K57_OVERSEAS_ML_STD_V3.4.84_Build170626 $ hikpack_2.5 -t k41 -i FWpart1
Magic : 484b5753
hdr_crc : 00001cad (OK)
lang_id : 00000001
date_hex: 20150315
devclass: 00000044
File: cramfs.img, CRC OK
Can't read new_20.bin tail
alastair@PC-I5 ~/cctv/NVRFirmware/3.4.84/DVR_K56_K55_K57_OVERSEAS_ML_STD_V3.4.84_Build170626 $ hikpack_2.5 -t k41 -i FWpart2
Magic : 484b5753
hdr_crc : 00001d7a (OK)
lang_id : 00000001
date_hex: 20150315
devclass: 00000042
File: cramfs.img, CRC OK
Can't read new_20.bin tail
alastair@PC-I5 ~/cctv/NVRFirmware/3.4.84/DVR_K56_K55_K57_OVERSEAS_ML_STD_V3.4.84_Build170626 $ hikpack_2.5 -t k41 -i FWpart3
Magic : 484b5753
hdr_crc : 00001d5e (OK)
lang_id : 00000001
date_hex: 20150315
devclass: 00000043
File: cramfs.img, CRC OK
Can't read new_20.bin tail
alastair@PC-I5 ~/cctv/NVRFirmware/3.4.84/DVR_K56_K55_K57_OVERSEAS_ML_STD_V3.4.84_Build170626 $
alastair@PC-I5 ~/cctv/NVRFirmware/3.4.84/DVR_K56_K55_K57_OVERSEAS_ML_STD_V3.4.84_Build170626 $ cat split.txt
head -c 14651904 digicap.dav > FWpart1
tail -c 30688256 digicap.dav | head -c 14656000 > FWpart2
tail -c 16032256 digicap.dav > FWpart3
alastair@PC-I5 ~/cctv/NVRFirmware/3.4.84/DVR_K56_K55_K57_OVERSEAS_ML_STD_V3.4.84_Build170626 $