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If you upgrade firmware then you should complete operation.
But if you try to downgrade then you'll get problem with flashing t190. (I have patched flash which can downgrade any version).
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YES, AND T191 IS THE SOME. I haved T191 111711, i put on 111811, and now is imposible to put 111711 or 111911...""transmition part 0 "phone only beep beep beep"
BR
ALRU |