i9300 - No network, I have IMEI, no product code

Hi,

I lost my IMEI trying to upgrade from ROM 4.3 to 5.1 from ArchiDroid I lost my folder EFS too.
Well, I took my samsung galaxy s3 for service box, they have restored the original imei.

The smartphone it was working well for a while and suddenly the phone restart and show on notification bar the message
"NO SIM CARD"
I took my S3 again to service box, and they change "SIM CARD READER"
Works fine again, but suddenly the phone restart and show the error "no sim card", yes, again.

So, here I'm trying to repair this error:

I have several info, from Phone Info:

*General*

Manufacturer / Brand:
Samsung

Phone Model:
GT-i9300

Product Name:
m0xx

*CSC Code*

Product Code:
Not Active

Original CSC Code:
TFG

Firmware's CSC Code:
TFG

Active CSC Code:
TFG

Available CSC Codes:
Appears in blank

CSC Country:
OPEN / CL

Mobile Operator:
73402

*Firmware*

Bootloader Version:
I9300XXUGMK7

PDA Version:
I9300KTUKOA1

CSC Version:
I9300TFGKOA1

Baseband Version:
I9300UBUGNG1

Kernel Version:
3.0.101
Boeffla-Kernel-7.5-Samsung-i9300-20150208@andip71 #1 32-bit

Java Virtual Machine:
Dalvik 1.6.0

*Android*

Root Existence:
Yes

Android Version:
4.4.4

Build Number:
MoRoROM 4.4.4(OA1) v3.1 AROMA (i9300KTUKOA1)

*Hardware*

Hardware / Board:
smdk4x12 [32-bit]

Platform / Chip:
exynos4 / exynos4412

GPU:
ARM Mali-400 MP

Modem Board:
Appears in blank

Hardware Revision:
REV_

Any solution or advice for this?

Thanks in advance!

P.S: I'm from Venezuela, my operator is Digitel.

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