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I have an unlocked V35 from ATT. It currently has Android 9 with the May 1, 2019 security patch (V350AWM20b). I downloaded the latest Android 9 kdz file (V350ULM20e_00_NAO_US_OP_1007) to get rid of the ATT stuff and allow features like wifi-calling and tethering to work with T-Mobile. LGUP recognizes my phone but gives an error that says the SPC code does not match. This doesn't make sense as my understanding is that SPC codes are only for CDMA phones. Furthermore, I can't download OTA updates (even with a valid ATT SIM card in the phone). Does anyone have a solution? Thanks.

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