Sim Detected/No Signal "can't connect to this network at the moment try again later"

Hi I had my phone flashed with a custom rom. But later i wanted to switch back to stock. I used the SP tool to flash
Back "sprout_reference_pack_1379542-KPW53_ALPS.KK2.AOSP.SPROUT.SP.p52_karbonn".

But before flashing i accidently used the "Format" tab of SP tool.
After that i flashed my phone to stock.

I have no signal. Sim card is detected.

I tried to switch to lollipop stock still the same error. I switched to other roms too but still no Signal and
"can't connect to this network at the moment try again later" if i do a manual connect.
I noticed that first 2 or 3 times on each rom the manual scan select gave error "Network search error".

The Memory Test Tab of Sp flash tool

Code:

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============ Memory Detection Report ===========

Internal RAM:


External RAM:

        Type = DRAM

        Size = 0x40000000 (1024MB/8192Mb)

NAND Flash:

        ERROR: NAND Flash was not detected!

EMMC:

        EMMC_PART_BOOT1        Size = 0x0000000000400000(4MB)
        EMMC_PART_BOOT2        Size = 0x0000000000400000(4MB)
        EMMC_PART_RPMB        Size = 0x0000000000400000(4MB)
        EMMC_PART_GP1        Size = 0x0000000000000000(0MB)
        EMMC_PART_GP2        Size = 0x0000000000000000(0MB)
        EMMC_PART_GP3        Size = 0x0000000000000000(0MB)
        EMMC_PART_GP4        Size = 0x0000000000000000(0MB)
        EMMC_PART_USER        Size = 0x00000000e9000000(3728MB)

============        EMMC Test        ============

EMMC Pattern Test(0x5A5A):

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And its timer continues to go on with red line Download DA 100%
I guess it has to do with NAND.
ERROR: NAND Flash was not detected!

Please tell me how to recover NAND on MT6582