For your information, if it can help :
I installed Global ROM (xiaomi.eu_multi_MI6_V8.2.25.0.NCACNEC_v8-7.1.zip) with success. But I have the same problem than with my former ROM (China 8.2.26 and CHina 8.2.22).
Actually, the Gear App crashed after cliquing on the "connexion to Gear" button...