Is it possible to upgrade from A9 to A10 directly ?

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I mean upgrading directly from android 9 with a .zip inserted in GPS sdcard slot .
When I insert the SD card containing the .zip of Android 10 ROM, the HU ask me if Iwhant to upgrade. Is that possible without installing the A10 bootloader first ? (I dont achieve to install the bootloader with SD card created with the RK tool)

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    You might have missed a few steps, including a read of how to.
    I always read carrefully before asking.
    I followed strictly the explained méthods on several topics.
    The problème IS NOT HERE !

    So now I asked à simple question.

    Then if you have à solution, please tell me/us
    If it's to criticize stay away. Thanks