Actually, when I initially flashed it, I didn't see the S7562_C on the pcb. I was thinking, eh, what the heck, I have CWM Recovery so what could go wrong. Soon after the flash, the phone said something wrong with the boot (Dead boot) and then it just didn't start. Hard brick, as there were no power. I then JTAG'd it and since the JTAG I used didn't have the dump for the specific S7562C, I used the S7562 dump. It reformatted the EMMC just fine.
Here's the log:
Easy-Repair file load OK!
Using EasyRepair Mode...
Warning , you are using custom pinout config make shure that NRST and GND on proper places!
Checking repair data...
EasyJtag Suite ver.: 2.0.0.0 / wxWidgets 3.1.0-W-U started.
Operating system ver.: Windows XP (build 2600, Service Pack 3).
For support and updates visit easy-jtag (dot) c o m
Check security...OK
Initialising: Samsung GT-S7562 Config ver.:1.01
I/O Level set to : 2600 mV
Box S/N: 0EFF*********0E ,FW Ver.: 01.52
Connecting to Target...
JTAG device: MSM7225A
CPU IDCODE : 0x106230E1 Mfg.: 0x070, Part: 0x0623, Ver.: 0x1
CPU Manufacturer: QUALCOMM , CPU Name: MSM7227A
Halting CPU...
Initialize hardware...
Starting target communication...
Detecting emmc memory parameters of bank (0) ...
EMMC #0 : ID : 0x01000015 Name : J5U00B Size : 3.6 G , (7634944) Blocks
EMMC #1 : ID : 0x01000015 Name : J5U00B Size : 2.0 M , (4096) Blocks
eMMC flash device(s) found, Device ID : 0x00150000
NAND Writing QCSBL...
eMMC Write OK! Elapsed time: 2.296875s (111.456 KiB/s)
NAND Writing MODEM...
eMMC Write OK! Elapsed time: 225.140625s (90.965 KiB/s)
NAND Writing PRT5...
eMMC Write OK! Elapsed time: 15.359375s (255.577 KiB/s)
NAND Writing OEMSBL...
eMMC Write OK! Elapsed time: 7.968750s (120.471 KiB/s)
NAND Writing APPSBL...
eMMC Write OK! Elapsed time: 7.359375s (130.446 KiB/s)
NAND Writing PIT...
eMMC Write OK! Elapsed time: 2.062500s (248.242 KiB/s)
NAND Writing MD5...
eMMC Write OK! Elapsed time: 8.031250s (255.004 KiB/s)
All Done.
After it was finished, I got it to boot to download mode, and I kept trying to load the original S7562_C firmware (JB) like you've mentioned. I kept getting (0x30) not initialized or something like that and I did a little research on the PIT file to see why I wasn't able to, and that's when I realized that the partitions were totally different. After that, I flashed the phone with the S7562 Firmware and bam! started up this bad boy. Then after that, I was like, eh, what the heck, lets do one better and flash a custom rom.
Now I have a working S7562_C with S7562 custom rom.
Here are some images of the phone. (Stored on pcloud, so you may have to sign up, sorry)
https://my.pcloud.com/publink/show?code=VZn6tXZb3uHHIKdTiLzCip2FIEv4pRSeoDX
Maybe with this information, we can compile a JB custom rom using GT-S7562_C firmware on the GT-S7562