Clone an operating system with "dd" tool.

Hello,
I have an SSD drive that using kind of Linux. It is an SSD drive for MITEL 3300 switch: https://www.telecomspares.com/images...20cxi%20II.jpg
I want to create a backup from it. The SSD drive has below structure:
Code:$ lsblk -f
NAME FSTYPE LABEL UUID FSAVAIL FSUSE% MOUNTPOINT

sdc
sdc1
vfat /sysro
020C-0000
sdc2
vfat /db 0257-0000
sdc3
vfat /vmail
02F6-0000
sdc4

sdc5
vfat /sysro
036A-0000
sdc6
vfat /db 037F-0000
sdc7
vfat /unused
03FA-0000First, I unmounted all of the partitions:
Code:$ sudo umount /dev/sdcXThen, used below command to create a clone:
Code:$ sudo dd if=/dev/sdc of=/home/jason/SSD.dd
234441648+0 records in
234441648+0 records out
120034123776 bytes (120 GB, 112 GiB) copied, 2850.17 s, 42.1 MB/sAnd:
Code:$ file SSD.dd
SSD.dd: DOS/MBR boot sector; partition 1 : ID=0x6, active, start-CHS (0x0,1,1), end-CHS (0x8f,254,63), startsector 63, 2313297 sectors; partition 2 : ID=0xb, start-CHS (0x90,0,1), end-CHS (0x3ea,254,63), startsector 2313360, 13799835 sectors; partition 3 : ID=0xc, start-CHS (0x3eb,0,1), end-CHS (0x3ff,254,63), startsector 16113195, 29543535 sectors; partition 4 : ID=0xf, start-CHS (0x3ff,0,1), end-CHS (0x3ff,254,63), startsector 45656730, 188784918 sectorsAfter it, I plugged another SSD drive with the same capacity and executed below command to recover the image to this new SSD drive:
Code:# dd if=SSD.dd | pv | dd of=/dev/sdc bs=1M
234441648+0 records iniB/s] [ <=> ]
234441648+0 records out
120034123776 bytes (120 GB, 112 GiB) copied, 4376.66 s, 27.4 MB/s
111GiB 1:12:56 [26.2MiB/s] [ <=> ]
1+2129501 records in
1+2129501 records out
120034123776 bytes (120 GB, 112 GiB) copied, 4415.03 s, 27.2 MB/sBut, when I plugged this new SSD to the switch then it doesn't work!
Am I used "dd" in the wrong way?

Thank you.