What else i did:
I have flashed with tool:
Mi Flash 2017.4.25.0
Firmware Version:
Xiaomi_Mi_Mix_2S_V9.5.15.0.ODGCNFA_20180425_8.0_China
-> clean all and lock
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I also flashed the MIUI10 fastboot pack
polaris_global_images_8.6.14_20180614.0000.00_8.0_global
/ extracted tgz
-> clean all, lock
flash_all.bat etc.
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Interim results:
Wireless charging still not working (no charging logo). Tried with different charger pads - Mi Mix 2 S device naked - without any case or cover.
Why there is no separate Hardware test for the wireless charger within Hardware test menu CIT of the Mi Mix 2 S?
There is only a test for line charging which passed my Mi Mix 2 S! Line charging is working.
I assume this is a hardware issue -> charging coil receiver inside the Mi Mix 2 S is faulty.
I would have exchanged the charging coil by myself but that spare part is just not available anywhere at the market.
In the meanwhile i had a livechat with al.E.....s, since my seller did not respond.
I should get an email from them within the next 2 weeks since i am eligable for refund procedure as a valued customer...
The final results of my journey through the service and after sales services desert i will post here next.