thanks! you are the saviourXiaomi phones with "dynamic partition" system (=phones launched with Android 10) can't mount "System" partition as writeable in TWRP (because TWRP doesn't support "dynamic partition" yet). Don't know if a workaround will be available later...
I will create and share my own "MIUI 11/12 Global Icon Pack Flasher" zips version and should work on 99% of phones.
INFO: zip files are NOT signed.
- For MIUI 11 icons => xiaomi.eu_MIUIv11_icon_pack_v1.2.zip
- For MIUI 12 icons => xiaomi.eu_MIUIv12_icon_pack_v1.2.zip
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