LG G2 F320S SIM Unidentified after upgrade - G2 Q&A, Help & Troubleshooting

Hello
I have bought a LG G2 phone the korean version F320s it was working fine on the stock rom Android 4.2.2 but when I have upgraded if to the 4.4.2 version via the LG Pc Suite it doesnt recognize any sim card.
"the usim card can not be identified" The card is working fine on other phone and it was working before the upgrade. Has anyone had the same problem? Does going back to the 4.2.2 version help?
Thank You for any help

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