Believe ?
Is it an M8s, M8sPro or M8sII
You must confirm chip. You cannot guess.
The screenprint on the bottom of the PCB says S905_1G_V12.
The lisiting I bought it from was S905 (not that it is proof)
CPU-Z app says 4xArm Cortex-A53 @ 2.02 GHz - Revision r0p4
The boot logo says S905
Mini MX+ banner across the corner of the box
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FYI - .005 works straight away.