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Some time ago I suddenly noted that wi-fi switch does not turn on wi-fi and I could not start wi-fi hotspot on xiaomi redmi note 4. I did not do any system update before that happened. As I've read on that problem on internet reset do not help, and neither it helped me later on. (installing some pdanet app did not help either).

In addition to wi-fi, also bluetooth starts (icon shows it's on, not like wi-fi always off), but does not find any devices.

I wanted to debug from PC, but neither Windows nor Linux see the phone connected as device, only charging worked. I was surprised to find out that OTG works, that points to software root cause IMHO.

The phone has non-removable battery, I cannot easily try what I've read as second advice (for samsung with wifi issue) - take out battery.

What could be the issue and what else do you advice me to try apart from selling for spare parts?

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This seems like a technical issue. There could be these possible reasons:

  1. It can happen if you manually change radio settings of the device (but will auto reset to default when you boot the device).

  2. It can happen if you are running your device with an outdated version of custom UI that is not installing OTA updates.

OTA Definition:

OTA Updates - Android devices gets OTA updates via developer provided directly to your phone under name 'software update' or 'system update' or in some devices directly through app named 'Updater'.

Solution is:

  1. Try factory reset to your device.

    Factory resetting to your device makes the device completely clean and settings will revert to the manufacturer default settings.

  2. Try manually updating the ROM.

    OTA update is an automatic process for keeping your mobile up-to-date while manually updating a ROM takes time and a little knowledge of android devices.

Benefit is - By manual updating you can get a custom ROM installed faster than others who are waiting for official OTA update that takes time.

Caution -Manual update can be a risky process for your device. Please search it well before trying manual process.

  • I mentioned in question that reset did not help. Maybe will try that update later. – Alexei Martianov Dec 6 '18 at 3:26
  • Please read 2nd point as well. It has your answer. – Amber Mishra Dec 6 '18 at 6:14
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Perhaps software could be the root cause as you suspect, in which case try to put your device into safe mode and see if the wi-fi and bluetooth are working as they should.

You can put your device into safe mode as follows:

  • First power off the device, then turn it on again.
  • When the Mi symbol appears while booting, start tapping continuously on the fingerprint sensor until the phone completely boots and then finally you will be in safe mode

If you do not see a change, then I'd suggest you reset Network settings:

Settings → More → Network settings reset

IMG:

If all that fails then I'd recommend re-installing the firmware, choose the right one here

  • How safe mode should look like? I don't see difference and for youtube video (youtube.com/watch?v=YGI2MkFKo5M) there are many comments that it is not working (I have MUI 9 too). As for reset, first, I don't see that option in 'more' on my phone, second, doesn't full phone reset should have done network reset? – Alexei Martianov Dec 23 '18 at 3:26
  • @AlexeiMartianov safe mode is supposed to look like this i.stack.imgur.com/qxP1q.jpg. As for your 2nd question I would say maybe or maybe not, I remember factory rest didn't solve one problem I was facing on my other Huawei tablet and I had to reinstall firmware (that's why I don't fully rely on factory reset), I propose network reset, perhaps it may address such issues first, if you don't see it, then first turn off MIUI optimisation (under developer settings) – xavier_fakerat Dec 23 '18 at 10:45
  • Settings reset did not appear after turning optimization off. (I guess xiaomi changed some in MUI since your advice was working) – Alexei Martianov Dec 29 '18 at 9:35

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