I updated to V22 today then to V23. So far no issue with dropped calls. I am using Maxis.

Also when incoming call, it does not stop the 3G service.

So far everything looks pretty good except for below:

1. Backup App missing.
2. Mi Key normally during bootup will let me choose the device but after update to V23, no option and have to run the Mi Key app.

I did OTA without doing any reset from V14.

Ok i got a wierd MI Powerbank question.

I remembering seeing somewhere (cannot remember) that you can charge the powerbank and also power up your phone. Any danger in this like overheating?

Also i got this crazy idea of using one powerbank to charge up another powerbank.

Basically daisy chain the power bank. First unit gets power from adapter then plug the output of the first unit to the input of the second unit.

I tried it and seems to work but worry if got any damage long term charging in this way.