Redmi Note 4 : wifi,bluetooth, speaker, microphone not working - Android Q&A, Help & Troubleshooting

For some reason, i had to wipe my phone clean so i did that by fastboot -w . Then i flashed various ROMs available for my device. All of them boot up fine but the wifi doesn't stay on. sim card is just not being detected. Bluetooth keeps crashing when i turn it on . Speaker and microphone are just not working. Can someone please help me out?

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[Q] Micromax Canvas 2 Audio and Microphone Problem after Flashing

Hi,
I Have tried many custom Rom for my canvas 2 but i am getting same kind of issues with audio and microphone after flashing it.
I have tried almost 8 different types of ROMs using CWM recovery mode.
1 .First its shows that Invalid IMEI & simcard not getting signal i fix it with Engineermode and manually enter the imei codes so its working.
2. Audio and Microphone not working. I can't hear anything and also can't record.
I need to know why am i getting this issues . Unfortunately i have not make any backup of my old ROM
Please help.

Galaxy S6 edge g925f touch key lights, auto brightness not working.

I have got into a very strange problem, touch key lights and auto brightness of my galaxy s6 edge are not working, I have re-flashed the stock marshmallow rom many times, even before flash, factory rest it.
All the sensors are working perfectly in the test service menu. but respective functions are not working.
Then I downgraded from android 6 to 5 lollipop, and i lost the test service menu after it, now *#0*# not working even.
Then again upgraded to android 6 and still the service menu not working, And today i found that the audio jack is also malfunctioning, If i put the handsfree phone gets shutdown immediately or it dosent works. The songs plays in the loud speaker.
Roms downloaded from samfirmware.com .
Flashed using odin.
Sorry for the English.
Try flashing the modem and bootloader for your specific device, then go into recovery and do a manual factory reset and see how you go. Little weird for things to be doing that. You might have damaged your device fm with downgrading and upgrading
Im having exact same problem ?

[FIXED] In call earpeace, Speaker, fingerprint not working after installing Android P

Hello guys,
I am in big trouble after installing Android P DP4. After 1.5 to 2 days of using android P dp4 my earpeace, main speaker and fingerprint stopped working. So, I went back to Oreo AOSCP. same problem there.
So I decided to flash MIUI and flashed MIUI 10 developer version all partitions from fastboot. Same problem there. No Fingerprint, no both speakers.
Plus when I connect phone (MIUI) in PC, It says Pixel XL, Why it is showing Pixel XL after flashing all the partitions??
Now you will say it is hardware problem.
But,
Fingerprint worked when registering while setup in android P. but not working to unlock phone.
Main speaker working when call comes. but not working while playing music (both custom rom and MIUI)
In call earpeace not working anywhere. But I am sure it's software problem. (tried flashing in call fix from GSI thread)
Any solution?
Fix: Automatically fixed.

Wifi and hotspot can't turn on

Hallo guys I need your help
I have a problem with my kenzo, wifi and hotspot can not be turned on, Bluetooth can be turned on but can not see devices that can be connected, IMEI is normal, I used havoc pie before using pixel experince also has the same problem, so please help me
I have also a same problem Wi-Fi, Bluetooth, hotspot not working and it is not going fastboot to edl with edl tool and it go edl mode only with edl point. I don't know was happed with this device. I buyed second hand device with this problem. I have tried all methods but didn't solve . Please help
Try flashing the MIUI 8 Fastboot ROM. It helps in similar situations where the persist partition gets corrupted. MIUI 10 can also work.

Microphone Problem in Android 11

Hi there
Since I updated my MI A3 to Android 11 the microphone sometimes doesn't record voices !
( I reset and flashed my phone so many times but didn't solve )
Upppppp
If you flashed stock with miflash... Probably the problem is hardware. I have flashed many stock and custom a11 firmware. And my microphone work well. A question. When you reflashed stock rom... You have changed the active slot? All updates are installed on slot b. So if want to make a good clean istallation... In my opinion is better set active slot to a via fastboot before flash. Try this. Also you can try a custom stable rom with oss drivers. But is important to make a good installation. Or the software problems may not be solved
Recently after owning a new car that is my first using Bluetooth handsfree option, I discovered this issue.
It seems the mic got somehow "stuck" to the car when I leave it, as the phone's normal mic then is okay. Just when trying to use the phone's handsfree mic in a call oder video calling in signal or hangouts it doesnt work. Even recording videos using the camera app is fine, but any handsfree option for any communication does not work.
Restarting the device or restarting bluetooth does not work. Somehow the phone recovers after sometime. When, why and how I do not know.
It definitely breaks down again once reconnected to the car.
with other bt devices have same problem?
Sadly I don't have any other bt device that is handsfree mic capable, I just own a speaker that is connected every now and then - it was my first idea to recover it by connecting to another bt device (the said speaker), but it does not work. Of course, the speaker is not connected using the same bt variant, the icon in the phone's settings is different.
mmmm... for this issue, the solution are: try delete all bt connection. if dont work try install latest software update. if dont work the definitive solution is wipe data and make a new clean installation. i suggest do this via miflash
wetito said:
If you flashed stock with miflash... Probably the problem is hardware. I have flashed many stock and custom a11 firmware. And my microphone work well. A question. When you reflashed stock rom... You have changed the active slot? All updates are installed on slot b. So if want to make a good clean istallation... In my opinion is better set active slot to a via fastboot before flash. Try this. Also you can try a custom stable rom with oss drivers. But is important to make a good installation. Or the software problems may not be solved
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is there a guide to do a good factory reset without unlock the bootloader?
boot into recovery and wipe data

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