engineer mode ? - Huawei Mediapad M3 Questions & Answers

I want to increase the mic sensitivity but can't find engineer mode with the usual Android codes, if I can at all. Is there any way to get to this mode or any other way I can turn up the mic gain?

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[Q] Earpiece volume too low

My earpiece volume too low.
I have hard time hearing people talking on the phone when outside of the house.
Anyone have any idea how to fix this ?
I have max out the volume in the setting even send to replace for another set.
It is the same.
There is a tweak with the secret service menu, BUT unfortunately the new settings cannot be saved so it is useless.
Indeed, the earpiece is crap (in terms of volume, not quality), the same for the speaker. I wish there was a permanent tweak...
There is HAC for vibrant. hoping there is a hack for SGS .

[Q] NO sound on the receiver

I just got the LG Quantum and I tried to unlock it using MFG. Since then, I can't hear any sound on when I make/receive calls unless I put it on speaker mode or plug in a headset!
Does anyone know how to fix it???
Semi Solution
I'm not sure if this will ever get noticed, but I think I probably need to start about here since I'm having very nearly the identical problem (and I can't post in the forum that I felt was more applicable since I'm a lurker/noob).
I can actually fix it by opening appmfg (dial ##634# password appmfg#*#) and then I go into ELT Mode / Manual Mode / Audio Loopback then just exiting, and that starts the audio working properly again, but this doesn't persist through reboots, so I'm hoping to fix that.
If I go to Engineer Menu / Device Test / Sound Test / Audio Call Tool, I can play around in there with RX Voice CAL, RX Device Volume CAL, RX Stream CAL and Subsystem CAL. In RX Voice I can change the settings and they stay while on that screen but revert if I go out and back into the tool (for all Device Types). RX Device Volume keeps the settings but not through a reboot I think, and it doesn't seem like changing them changes the actually sound output anyway. Same for RX Stream Volume. But Subsystem won't change any settings though it lets you try. I'm not sure if this is where I should even be playing around to fix this problem, but in the appmfg its the only place I've found to mess with audio settings.
I'm hoping that its a registry change that occurs when I use audio loopback to reactivate my hardware speakers and that I can apply that tweak permanently, but I'm not familiar with messing with WP7 registry. How should I try to investigate that? I theoretically unlocked my device, I've been thinking about sideloading a registry tool but I haven't just yet, I'd like to see what folks think about the problem in general. I did try going back to 7.0 but it was no different than 7.5 for my audio. The other weird thing is that sometimes it will make notification noises all by itself, but it won't play music through the speakers or anything like that. This is a just for fun phone so it doesn't have a SIM, and I can't, like, return it or anything.
It seems like WP7 has a lot of audio glitches like this, I've found a number of similar threads with no solution for mine or to improve mine.
http://forum.xda-developers.com/showthread.php?t=919089&highlight=no+sound|audio
http://forum.xda-developers.com/showthread.php?t=1334273&highlight=no+sound|audio
http://forum.xda-developers.com/showthread.php?t=1039415&highlight=no+sound|audio
http://forum.xda-developers.com/showthread.php?t=822716&highlight=no+sound|audio
http://forum.xda-developers.com/showthread.php?t=1298624&highlight=no+sound|audio
http://forum.xda-developers.com/showthread.php?t=1251832&highlight=no+sound|audio
Anyway, if this gets noticed it'd be great if someone knows a better fix.
sound issue
i too am having a no handset audio issue. in test loopback modes all speakers work. the headset just isnt relinquishing sound to the handset, i was hoping someone out there knows the registry enough to tweak the sound options or make a super simple app that will let me select the speaker since the software maybe having an issue.

MTK Engineering-How to increase Speaker(handset) volume levels during a conversation?

MTK Engineering-How to increase Speaker(handset) volume levels during a telephone conversation?
I have a problem with the volume during a call
I installed the MTK Engineering (Google Play) on my Goclever Quantum 4.
I was trying to increase the volume.Unfortunately, there are a lot of shortcuts that do not understand (sip, sph, etc.).
I tried to change the value of an intuitive way.
After either try and restart the phone I set a good level of the earpiece volume during a call.
Now I do not know how I did it?
Can someone explain to me step by step how to with program the MTK Engineering increase the volume level during a call on the handset (not the speaker or the headset).
How to increase only the level of the handset without adding other levels?
I will be grateful for your help.
Regards

Service Menu to Increase Headphone Volume

Did anyone find a way to access the service menu to Increase Headphone volume? I am not rooted. So service menu is my only option to Increase the volume.
I use the Hearing Aid option in google dialer...
Phone/settings/accessibility

engineering code for volume increase

hi guys,
Can anyone help me to increase the volume of the device from the system, for some louder output as I have low volume on the earphones and also through bluetooth...
Some vids mention about engineering mode code.. : *#*#3646633#*#* which never worked for my N910 C
Thank you for helping..

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