Is it possible to Lose iCloud Activation lock by Downgrading to iOS 6 on iPhone 4?

I have a iCloud locked iPhone 4 which was factory unlocked. I hacktivated it using win SCP and now the sim won't work. So i thought why not downgrade to a version when Activation Lock wasn't even created. That way i will have a fully working iPhone on iOS 6 right? Is that possible?

Not possible. Unless you saved the phone BLOBS unique to that individual iPhone before upgrading from iOS 6 then the upgrade is irreversible.

Another reason the SIM might not be working is if the rightful owner of the stolen phone you currently possess has had its IMEI blocked.

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