I317m canadian note2 problems

Please I need help in my sgh-i317m canadian note2
I bought it used but for some reason cant detect my local network (Egyptian)
By some repaire in the service center changing sim card holder and usb scart
It worked and made calls but
It was on 4.4.2 and always hangs and restarts by itself..
So I played more and more in all available options roughly ��
So
I downgraded to 4.1.1 stock via odin but the surprise no imei and baseband unknown ��
My questions are:
1 how to know the original stock between those ?? And if the difference make this hang ??
http://www.sammobile.com/firmwares/database/SGH-I317M/
2 how to restore "servicemode" menu to original one cause I think it is the reason why I have no service now with custom rom based on 4.4.2 with correct imei and proper baseband but cant detect my network ������
Please help ...

Also when connected to computer detected as alcatel cdma phone if I dont modified it from *#0808# menu to pda in all roms stock and custom.
How to reset that phone ?

Couple questions before I sell my Note2 on Swappa.

Hey guys. It's been a while since I've poked around the Note 2 sub-forum. A year or so ago I picked up a pair of 2013 Moto X's for my wife and I to make my life a little easier. I had a note 2, she had a s3. Playing admin for two devices, and keeping up with their individual quirks was proving to take up too much of my time, so, we decided to stream line. I wouldn't say the Motos are better by any standard, but, making the switch has made my life easier.

Recently, we've decided to move. We started going through our drawers cleaning things out and found these devices and thought we should sell them. They're both bootloader unlocked, so, they can run the latest and greatest CM builds. The thing is though, I've pretty much forgot what I'm doing with them.

I don't want to odin the device back to 4.1 and re-unlock it all, but I do want to clean up the device so none of our information is on it before shipping it off to it's new owner.

Can anyone offer any advice on how to wipe on the Note 2? Any changes that I should be made aware of that's happened with the device in the last year or so? I was gonna flash the unofficial CM12 build with gapps but if there's any other recommendations I'd love to hear them.

Thanks in advance.