After install Miui 8.7.26 5GHz don't work.

[Cassius Brandhuber]

After update, from original 8.7.12 to 8.7.26 provided by Mi-Globe, Redmi Note 5 Global Version, and many tests. I can't see or connect in 5GHz wifi. I tried to format data, system, every partitions in phone. But no success. My wife still use the miui 8.7.12 with 2.4/5Ghz networks. I use TWRP 3.2.2-0. Both devices are the same.

[dr4kendroid]

After update, from original 8.7.12 to 8.7.26 provided by Mi-Globe, Redmi Note 5 Global Version, and many tests. I can't see or connect in 5GHz wifi. I tried to format data, system, every partitions in phone. But no success. My wife still use the miui 8.7.12 with 2.4/5Ghz networks. I use TWRP 3.2.2-0. Both devices are the same.

Does it work again when you go back to 8.7.12 ?
You can do twrp backup and try it.