Are you using the 5-bar indicator?
If so, it is meaningless for comparison between different devices. Some devices include a partial assessment of quality (RxQual, Ec/n0 or RSRQ, technology dependent), also they are notoriously inaccurate.
Also using that bar indicator for signal strength is...
Great to see a volunteer to assist.
Whilst I am not involved in translations (my foreign language skills are woeful) I am really grateful for your offering to assist.
The contacts for getting involved are listed in the first one or two posts.
5GHz WiFi has been changed late last year due to new regulations from EU Regulatory organisations.
Xiaomi did some changes on the functionality with 5GHz, but I do not remember the details.
Do a search on the forum archives, there was a lot of discussion and trials as to what and how and if it...
I have not tested 1-3-7 CA, but from one other poster 12-15 months ago, they could not get it to work.
CA is more related to hardware in the RF Chipset, some CA combinations/variants are a Qualcomm "option" which the phone maker has to pay extra - guess how Xiaomi and other "low-cost" makers...
Just because Safety net has passed, does not mean that Google pay will work - it is (most likely) only one of a myriad of security checks which Google requires to be complied with for their application to work.
If the phone is not released for Global/EU markets, then often the hardware does not support B20.
This was the case in the Mi5, whilst the chips would support B20, however the PCB on which they were mounted did not have any connectivity, so B20 was not possible.
The ROM's will support the band's...
You need to back up all your data off the phone, boot into TWRP, then go to wipes, and "FORMAT DATA", acknowledge acceptance by typing "yes" ( without quotation marks).
This removed the encryption that will allow you to boot properly.
Once you have done this, you must download the xiaomi.eu...