[Please help] Sim card not detected in Infinix x551 pro running kitkat 4.4

[platinum6ix]

Hello guys, please I need your help.

Please I successfully downgraded my Infinix x551 pro from lollipop (5.1) to kitkat(4.4). Everything worked normal expect for the fact that the phone was unable to detect sim card.
I flashed it back to lollipop and sim card was detected. I flashed it back to Kit Kat again and I got a notification saying “Sim card not detected”.

I thought the fault was from the Kit Kat rom. I downloaded and flashed another Kit Kat rom. Still the same thing, ”sim card not detected”.

Please how do I resolve this?

[X3non]

Hello guys, please I need your help.

Please I successfully downgraded my Infinix x551 pro from lollipop (5.1) to kitkat(4.4). Everything worked normal expect for the fact that the phone was unable to detect sim card.
I flashed it back to lollipop and sim card was detected. I flashed it back to Kit Kat again and I got a notification saying “Sim card not detected”.

I thought the fault was from the Kit Kat rom. I downloaded and flashed another Kit Kat rom. Still the same thing, ”sim card not detected”.

Please how do I resolve this?

is the device still on the kitkat rom?
did you verify if the IMEI and baseband are intact while on the kitkat rom?

[platinum6ix]

The Imei was indicating invalid and I was unable to change it by using unclemobile or chameleon..

I didn't picture the band base.. Please do I need to flash back to kitkat to acquire the band base info?

[platinum6ix]

is the device still on the kitkat rom?
did you verify if the IMEI and baseband are intact while on the kitkat rom?

The Imei was indicating invalid and I was unable to change it by using unclemobile or chameleon..

I didn't picture the band base.. Please do I need to flash back to kitkat to acquire the band base info?

[hovatek]

The Imei was indicating invalid and I was unable to change it by using unclemobile or chameleon..

I didn't picture the band base.. Please do I need to flash back to kitkat to acquire the band base info?

Here's what, backup your NVRAM and Secro while on lollipop. Would you need help with that?

[platinum6ix]

Here's what, backup your NVRAM and Secro while on lollipop. Would you need help with that?

Yes please.

[hovatek]

Yes please.

OK
Do you have TWRP for both Kitkat and Lolllipop?

[platinum6ix]

OK
Do you have TWRP for both Kitkat and Lolllipop?

Yes sir, I do.

[X3non]

Yes sir, I do.

flash the lollipop rom > flash TWRP > boot into TWRP > select backup [tick nvram and secro] > backup to SD card > flash back KK > flash TWRP > boot into TWRP and restore the nvram and secro backup

[platinum6ix]

flash the lollipop rom > flash TWRP > boot into TWRP > select backup [tick nvram and secro] > backup to SD card > flash back KK > flash TWRP > boot into TWRP and restore the nvram and secro backup

Wow, look how easy the tutorial is, thanks in a million.
Please is that all the process?