I upgraded my Z10 to 10.2.1.537 using BB Link but now my WiFi calling doesn't work. After reading threads here I now realize WiFi calling doesn't work on the Z10 with this version for T-Mobile yet. I see the latest version to get WiFi calling on Z10 is BlackBerry OS 10.1.0.4780 (SW Release 10.1.0.4200) - Current versionbut it doesn't explain how to go back to this previous version. Is there a link to revert back that I'm not seeing on T-Mobile website?
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How do I go back to 10.1.0.4780
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