Database Users

SWM8802 Bluetooth settings missing

Hi,
I've just purchased one of these head units for my car. I can connect my phone to it via Bluetooth just fine for calls and music, but I want to connect the head unit to my ODB2 bluetooth dongle so that I can create a Torque dashboard for it.
However, when I go to the general settings, Wifi is listed but Bluetooth is not. I've searched and searched but there is no way for me to connect the head unit to a Bluetooth device. I've tried various third party apps that claim they are able to enable Bluetooth and connect to devices, but they all just seem to hang when I try to enable Bluetooth. Tried a system reset too, but that Bluetooth option is still missing from the settings menu.
Please can anyone help?
G

I'm also interested in knowing this. Torque doesn't seem to detect my bluetooth ELM327 at all. I also attempted to connect a USB-based ELM327 module, and Torque seems to detect it, but it doesn't work beyond that, and the headunit gives me a low-power warning light.

Hi did you get anywhere with this I have the same problem can't get Bluetooth options to show

I have exactly the same problem. I'm running a PX5 unit from Witson. Custom built for a Koleos. MCU is not a standard MTC device. I have no bluetooth option available in the settings and the stock bluetooth app does not display any search option whatsoever. It seems that it broadcasts itself for other devices to detect it but you can't search for devices. Seems like they may be handling the bluetooth via the MCU directly and not via android which is strange because they openly claimed that this device was compatible with the OBD II dongle that I purchased. They even shipped it in the same package. Will keep looking and post if I find anything.

I had the same problem with a different Chinese head unit. Solved by buying a WiFi ELM327 dongle which connected fine with the head unit's built-in WiFi.

Update to my earlier post...I managed to get mine working over BT with the WITSON unit. In the end I had to disconnect my phone completely and reboot the unit. Then I found a search option on the dialer page. Searching found the OBD II module and I was able to pair with it. After I was paired with it I was able to add my phone again and both can run in parallel. I have not been able to test much but it seems like this continues to work until the unit goes into a deep sleep and shows the startup logo again. If that happens then I need to go through the learning process again. Meh...

Hi friend, just a question, in the dialer where did you find the search option I cant find it in my android radio??

If you have the swm 8802 you cannot connect to obd2 this requires bluetooth 4 and the 8802only support bluetooth 2

Always Connect ODB First
The ODB readers are a tad picky but they connect using the same menus as any other BT hardware (headset, speaker, etc). First, turn on the car ignition, do not start.
2. Make sure no other BT equipment is connected to the head unit or even on & near by.
Next, place the head unit in searching/Discovery mode and then & only then plug the ELM BT Module into the car ODB II Port. Most cars must be 96 & newer. 95 GM with for the plug but won't work. They're usually ODB 1.5, don't ask, your screwed.
Finally wait for the module to pop up and ask for the code, it's 1234 not 0000.
After your paired, THEN open Torque and let it connect. Don't start the vehicle till the car icon stops flashing.
You should be good to go from then on. If you ever have problems after that. Make sure the app is totally closed, force stop and then follow this procedure again.
---------- Post added at 07:55 AM ---------- Previous post was at 07:30 AM ----------
vincentstans said:
If you have the swm 8802 you cannot connect to obd2 this requires bluetooth 4 and the 8802only support bluetooth 2
Click to expand...
Click to collapse
Mine connected no problem. Did it just like I do on my phone. I just got mine too though. Could be an update maybe

the original question wasn't answered and I have that problem too. I don't have a Bluetooth discovery/search option anywhere. the small bluetooth-like icon on the main panel just changes the color of the leds.
so can't connect new phone. although Bluetooth seems to be working, since an older phone, already paired, is still working.

Following this as my head unit is same. Theres no blietooth menu/option but it connects to a phone.
Ive tried a third party bluetooth manager but all that says is bluetooth disabled by admin??

A fix
That happened to me trying to add and ODB2 bt dongle. I had to use the app for bluetooth linking provided by the head unit. When I purchased the unit, I changed the bluetooth discovery and pairing code to 0000. Well, changing it to 1234 allowed me to add the ODB dongle.
I saw it on a YouTube video, and well, it worked for me. (And no, no native bluetooth option, came disabled for my unit as you said)
Hope it works for you too.

same problem with me
Hi sir did you found solution for this problem. I also have this problem with my native bluetooth. when i turn open system setting bluetooth missing. i try to open using shotcut and found shotcut to turn on bluetooth but when i turn on. it do nothing.
I can play music, make call using bluetooth app provide from head unit. Problem is i cant use it with OBD2 . same with your statement this bluetooth only stream signal to other. this Head unit cannot find other bluetooth.
Kindly please assist me. did this head unit still have hope to turn on native bluetooth or not. I still search many post regarding this issue. But issue bluetooth like this not many discussion.

Hello there,
My problem is some how different. My hu use the bluethoot to find the obd2 adapter but there is no dedicated pair button. I can pair my phone for calls and music but connecting from phone to hu.
My unit is a 8227l from seicane.
Has anyone any solution? Thank you!

blongro said:
Hello there,
My problem is some how different. My hu use the bluethoot to find the obd2 adapter but there is no dedicated pair button. I can pair my phone for calls and music but connecting from phone to hu.
My unit is a 8227l from seicane.
Has anyone any solution? Thank you!
Click to expand...
Click to collapse
Change the pair code in the bluetooth custom app provided, to 1234 and try again.

I had this happen and I think I figured it out.... in factory settings there's an option to choose bluetooth connect automatically or with pin. I checked with pin and was able to pair. I think the options are reversed in the settings

I have the same problem i can't connect to the android 7.1 car head unit any more , the bluetooth setting is missing , the wifi settings appear but bluetooth doesn't appear any more
Anyone can help me to fix this issue please ?

Karemz said:
I have the same problem i can't connect to the android 7.1 car head unit any more , the bluetooth setting is missing , the wifi settings appear but bluetooth doesn't appear any more
Anyone can help me to fix this issue please ?
Click to expand...
Click to collapse
I bought a bluetooth usb adapter and I can't select it on the system. I think this would be the way out, but we need to replace the driver inside android. Does anyone have any ideas?

venomrocha said:
I bought a bluetooth usb adapter and I can't select it on the system. I think this would be the way out, but we need to replace the driver inside android. Does anyone have any ideas?
Click to expand...
Click to collapse
I have a Teyes Spro with the same Bluetooth issues as most on this post describe. Did you find an answer to your usb adaptor to solve the Bluetooth problem? I was told to add a line to the config.txt file but cannot locate where to access that to add it.

Bought a Teyes Spro headunit and I have a problem with Bluetooth discovery on my obd II and tpms modules. Does anyone know what is in the "Developer" tab? It is password protected not accessible. The 168 factory access code does not work for it. Anyone know the password?

OBD

hello to all
i have enable the OBD present on my unit and added to the connector. it is connected by bluetooth (or i should connect by usb)?
altough i cannot pair it i think
is there any procedure to correctly do it?
thanks

It should work with bluetooth but you have to pair it through the OBD app not the Android settings menu.

nic2k said:
It should work with bluetooth but you have to pair it through the OBD app not the Android settings menu.
Click to expand...
Click to collapse
thanks @nic2k i do not have acess to bluetooth settings...only phone bluetooth on my device. what do you suggest?
thanks

mclaudio said:
hello to all
i have enable the OBD present on my unit and added to the connector. it is connected by bluetooth (or i should connect by usb)?
altough i cannot pair it i think
is there any procedure to correctly do it?
thanks
Click to expand...
Click to collapse
go to my thread:
https://forum.xda-developers.com/an...china-head-unit-8227l-obd-connection-t3990607

Px6 rk3399 obd
HI All,
I just installed this unit. ( sorry, will not allow me to post link)
Android9 13.6" Tesla style Car No DVD Player GPS Navigation For Ford Mondeo Fusion MK5 2017+ radio tape recorder multimedia unit
There is a setting for Speed+ Rotation. which does not seem to work, I have tried several possibilities but can't get it to work. I am of the understanding the the OBD Plug is connected to the ECU under the dash. There are only 2 pins on the plug from the Head unit. Is there an additional setting or perhaps i'm missing something.

Identify android head unit with BT problem

Hello! I've got Winca W2-RL1051 Android 9 Head Unit. Unfortunately I can use bluetooth connection with my iPhone only. OBDII adapters (I've tried four models) don't create a pair with it. Head unit finds it, requirea password, writes "Connect OK", but it doesn't work in Torque or Hobdrive. I hope the problem is in soft.
I attach HWGEtInfo.zip from my head unit. Can anyone tell me what to do?
Thanks in advance!

JimmyZ75 said:
Hello! I've got Winca W2-RL1051 Android 9 Head Unit. Unfortunately I can use bluetooth connection with my iPhone only. OBDII adapters (I've tried four models) don't create a pair with it. Head unit finds it, requirea password, writes "Connect OK", but it doesn't work in Torque or Hobdrive. I hope the problem is in soft.
I attach HWGEtInfo.zip from my head unit. Can anyone tell me what to do?
Thanks in advance!
Click to expand...
Click to collapse
Based on the HWGetInfo you do have a FYT compatible unit.
Does the name of your OBD device start with OBD or Gooddriver? If yes, it should be able to pair. If your OBD device has a different name you can forget it (although you might still try #14 of my Q&A thread)
Secondly: These units are quite stupid. What is the pincode you need to pair your OBD? If it is different from the standard pin code (1234 I think) of your unit, then change the pin code of the unit to the OBD pin code.
First unpair your iphone (same for android phones btw) and completely forget it.
Then (try to) pair your OBD device.
Then pair your phone again.

JimmyZ75 said:
Hello! I've got Winca W2-RL1051 Android 9 Head Unit. Unfortunately I can use bluetooth connection with my iPhone only. OBDII adapters (I've tried four models) don't create a pair with it. Head unit finds it, requirea password, writes "Connect OK", but it doesn't work in Torque or Hobdrive. I hope the problem is in soft.
I attach HWGEtInfo.zip from my head unit. Can anyone tell me what to do?
Thanks in advance!
Click to expand...
Click to collapse
try this video

Iraqmix68 said:
try this video
Click to expand...
Click to collapse
Thank you. But this program doesn't see any bluetooth device in my case. Bad luck.

surfer63 said:
Based on the HWGetInfo you do have a FYT compatible unit.
Does the name of your OBD device start with OBD or Gooddriver? If yes, it should be able to pair. If your OBD device has a different name you can forget it (although you might still try #14 of my Q&A thread)
Secondly: These units are quite stupid. What is the pincode you need to pair your OBD? If it is different from the standard pin code (1234 I think) of your unit, then change the pin code of the unit to the OBD pin code.
First unpair your iphone (same for android phones btw) and completely forget it.
Then (try to) pair your OBD device.
Then pair your phone again.
Click to expand...
Click to collapse
Thank you. The name of my device is 'OBDII". I tried, but it doesn't work. Maybe it's because of I don't know how to completely forget my iphone after unpairing. There ain't such option in Settings menu, Should I root my head unit?

JimmyZ75 said:
Should I root my head unit?
Click to expand...
Click to collapse
No. rooting your unit doesn't make a difference at all.
Does your phone see it and can connect to it when you plug the OBD device in your car?

surfer63 said:
No. rooting your unit doesn't make a difference at all.
Does your phone see it and can connect to it when you plug the OBD device in your car?
Click to expand...
Click to collapse
Yes, OBD device works ok with android phone and tablet. No problems at all.
Head unit can connect with phones only. It doesn't see another bluetooth devices (e.g. remote controller).

Settings -> Car settings -> Extra settings (password 123456) -> Config info ->
If the checkmark is in the BC6 checkbox, then you need to deactivate it and select BC8.
If BC8 is selected, then deactivate BC8 and change it to BC6, reboot the device,

jeev.ben said:
Settings -> Car settings -> Extra settings (password 123456) -> Config info ->
If the checkmark is in the BC6 checkbox, then you need to deactivate it and select BC8.
If BC8 is selected, then deactivate BC8 and change it to BC6, reboot the device,
Click to expand...
Click to collapse
There's no such options in the settings of my head unit, alas.

Literally have the same problem with you bro.
My headunit is 8227L china crap

Literally having same issue and also 2 of my friend's with our new head unit.
My headunit is a RK3399 PX6 from Sygav.
Obd2 shows in bluetooth menu but won't connect ever after using code 0000 and 1234.

Have the same issue. Gave up, return all OBDII bt devices. I saw a video by Charlston. He said Bluetooth obdII has to be in top level. So if you have multiple devices, remove and forget them and put the OBDII first (first position). If you get it working than put your smart phone in. Will try to add his link.

Anyone have problems with the Rear Defroster/rear defogger not working? It worked with my original unit. Guessing the wirings incorrect on the new Allwinner T3 I bought. XRC-403 2019 04 12. Guessing that's the number on the back of the unit. I have a Single Zone.

Can you help me connect Bluetooth obd2 adapter with Nakamichi android car stereo. The Bluetooth settings in the unit does not have the option to change the password which is 0000.All my obd adapters use 1234.Please help.
Also the joying unit in my other car connects with adapters that only have obd2 as their internal name..

Connect more than 1 iPhone to Zlink possible?

Hi,
I just got my Android Head Unit installed in my car with Zlink to use Carplay. I am an experienced computer and iPhone user but have never worked with Android or an Android Head Unit. Can I and if so how do I connect a second iPhone to Zlink and Carplay?

only one device can be displayed

makiavelic1 said:
only one device can be displayed
Click to expand...
Click to collapse
I know that because I have Carplay in my other car. But both I and my wife use this car and I can't find where/how to connect her phone too? When Carplay opens there are no such options so it must be in Zlink somehow?

that is in the iphone carplay settings and the radio automatically connects to the last paired device

I understand that but where do I add the second phone? Shall I turn mine off and let Zlink look for a new phone?
I have a problem that people can barely hear me on the phone. The Carplay volume was also very low but that I managed to fix with Siri talking and at the same time increase the volume on the steering wheel. Also it takes a very long time before Zlink / Carplay starts when starting the car. The guy I bought it from asked me to reset the unit.
First time I used it I connected wifi in Zlink but now on a video i saw the guy connected hot spot in Android. Which way should I use now after resetting the unit?
And thanks for your help!

you = I understand that, but where do I add the second phone? Do I turn mine off and let Zlink search for a new phone?
=yes, cancel your pairing and let the second phone connect

Ok got it. Can I make other settings in Zlink by opening the app?

not much

You forgot to tell me where I should connect my wifi? To Android system as hot spot or in Zlink option? My unit has a SIM card installed if that makes any difference?
The Bluetooth as I understand I will connect on OEM phone app?

carplay works with wifi and bluethoo transmission the sim is only to give internet to the android system (google maps etc) not for carplay actually carplay is on your mobile and mirrors your radio

the rest already in google

makiavelic1 said:
carplay works with wifi and bluethoo transmission the sim is only to give internet to the android system (google maps etc) not for carplay actually carplay is on your mobile and mirrors your radio
Click to expand...
Click to collapse
So I should connect both Bluetooth and wifi to Zlink / Carplay?
I don't remember any option to connect BT on Zlink?

I found out today that people can't hear me using Carplay phone because the Android unit uses a built-in microphone on the screen and not Mercedes OEM.
Is this normal?

Bluetooth connection issues

Having trouble with OBD dongle. Have installed 3 apps and although dongle will pair with head unit, the only option to select within apps says 'dummy FF:00:00:00:FF:FF'. This comes up even if dongle isn't plugged in but at the same time dongle works fine with phone so thinking head unit is the issue. Does anyone know what the above means as can't find any info online.

Posy android system information including MCU version, no one here has working crystal ball.

I was just asking if anyone knows what the dummy error is but if you need to know the ins and outs then help yourself...
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

Alondonboy said:
I was just asking if anyone knows what the dummy error is but if you need to know the ins and outs then help yourself...
View attachment 5800783
View attachment 5800785
Click to expand...
Click to collapse
This is mostly a not compatible OBD dongle...
Give us a link to the dongle if it is a ELM327.
Alternativ: Connection PIN is not the same as the standard in the head unit.
All Klyde units come with standard "0000" and most OBD come with "1234". You need to change the PIN in the head unit in front.
Also: Don´t connect a phone in front. If you already connected a phone, you need to delete that from the head unit, switch off the phone, set the PIN and first connect the OBD dongle. If this is then done, you can connect your phone afterwards.

rigattoni said:
This is mostly a not compatible OBD dongle...
Give us a link to the dongle if it is a ELM327.
Alternativ: Connection PIN is not the same as the standard in the head unit.
All Klyde units come with standard "0000" and most OBD come with "1234". You need to change the PIN in the head unit in front.
Also: Don´t connect a phone in front. If you already connected a phone, you need to delete that from the head unit, switch off the phone, set the PIN and first connect the OBD dongle. If this is then done, you can connect your phone afterwards.
Click to expand...
Click to collapse
I have 2 dongles, an ELM237 and an Erisin ES357. Both work fine with same app on phone but just not with head unit, so I know the dongles are fine.
I have changed the PIN to 1234 and both dongles will pair with Bluetooth on head unit. My problem is that when I open the app and it asks me how I want to connect, I select Bluetooth and then it gives me option to select what and dongle is not there, only option is what I've stated above and I do not understand what that is. That option is even there when no dongle is plugged in.
I have installed 2 other OBD apps and they all come up with the same problem.
I did turn my phone off and leave it upstairs last time I tried in case dongle was attached to that somehow and could not communicate with head unit, regardless the fact it was paired. I have not, but will, unpair phone from head unit and try dongle again as that is about the only thing I haven't tried.

Alondonboy said:
I have 2 dongles, an ELM237 and an Erisin ES357. Both work fine with same app on phone but just not with head unit, so I know the dongles are fine.
I have changed the PIN to 1234 and both dongles will pair with Bluetooth on head unit. My problem is that when I open the app and it asks me how I want to connect, I select Bluetooth and then it gives me option to select what and dongle is not there, only option is what I've stated above and I do not understand what that is. That option is even there when no dongle is plugged in.
I have installed 2 other OBD apps and they all come up with the same problem.
I did turn my phone off and leave it upstairs last time I tried in case dongle was attached to that somehow and could not communicate with head unit, regardless the fact it was paired. I have not, but will, unpair phone from head unit and try dongle again as that is about the only thing I haven't tried.
Click to expand...
Click to collapse
I use Torque on my units and I also own a CSM4 unit and that works flawlessly with my 2 cheapo ELM 327.

rigattoni said:
I use Torque on my units and I also own a CSM4 unit and that works flawlessly with my 2 cheapo ELM 327.
Click to expand...
Click to collapse
I've no problem with either on phone, just head unit. That's why I'm trying to find out where the conflict is as unit Bluetooth pairs with either dongle but App doesn't see it???

Well I guess you guys don't know either

Alondonboy said:
Well I guess you guys don't know either
Click to expand...
Click to collapse
Which app you are talking about???
You never stated that. If the unit connects to the OBD dongls there is nothing wrong.

rigattoni said:
Which app you are talking about???
You never stated that. If the unit connects to the OBD dongls there is nothing wrong.
Click to expand...
Click to collapse
The main one is Torque but have downloaded 2 other similar apps and there is the same problem. Unit pairs with dongle, no option to select it in apps.

Alondonboy said:
The main one is Torque but have downloaded 2 other similar apps and there is the same problem. Unit pairs with dongle, no option to select it in apps.
Click to expand...
Click to collapse
As I said... no issue at all with my CSM4 and others. I use Torque pro since years now, with a $6 cheapo ELM 327.
Write a mail to Klyde and ask for support, may be there is something wrong with your unit... but don´t expect an answer before Jan 28th. They are on Chinese New Year holiday.

Seller has said that the dongle they sold is not compatible with the unit, said I need an ELM327. Told them I already had one and that didn't work with the unit either so this morning they messaged and said they had another model dongle and that they had tried it, that worked and they would send it. Thought they were all supposed to be generic? Trying to uplad video to show issue but keeps coming up with error. File probably to large so am reducing quality and will try again.

Video

Your Galaxy is listed first, try remove it from the paired list so only the OBD unit is on the list, reboot and try again.

kommando said:
Your Galaxy is listed first, try remove it from the paired list so only the OBD unit is on the list, reboot and try again.
Click to expand...
Click to collapse
I've done that. Unpaired it and even left it upstairs to make sure there was no conflict with stereo or in case OBD was trying to connect to phone.

Alondonboy said:
I've done that. Unpaired it and even left it upstairs to make sure there was no conflict with stereo or in case OBD was trying to connect to phone.
Click to expand...
Click to collapse
Last thing I would try, because some guys had same issues long time ago with some MTCD units...
Remove the OBD dongle shut off the phone or just switch off the BT completely.
Unpair both, use a small pin and press the RST button at the front of the unit. (or just unconnect the battery for a second.)
Then stick in the BT dongle after the boot process is complete and pair it again. Try to setup the BT dongle in Torque.
If this then is possible it clearly is the reason that you had your phone connected first at the beginning.... if not, wait for the dongle from Klyde.
BTW: This needs also be done once you get the new one. If you have luck they send it tomorrow, but I would not bet on it... because tomorrow is there last working day until end of January.
Alondonboy said:
Thought they were all supposed to be generic?
Click to expand...
Click to collapse
Unfortunately not. I´ve seen some OBD with ELM327 which did not work... That´s the reason I told to buy a cheap one and give it a try.

rigattoni said:
Last thing I would try, because some guys had same issues long time ago with some MTCD units...
Remove the OBD dongle shut off the phone or just switch off the BT completely.
Unpair both, use a small pin and press the RST button at the front of the unit. (or just unconnect the battery for a second.)
Then stick in the BT dongle after the boot process is complete and pair it again. Try to setup the BT dongle in Torque.
If this then is possible it clearly is the reason that you had your phone connected first at the beginning.... if not, wait for the dongle from Klyde.
BTW: This needs also be done once you get the new one. If you have luck they send it tomorrow, but I would not bet on it... because tomorrow is there last working day until end of January.
Unfortunately not. I´ve seen some OBD with ELM327 which did not work... That´s the reason I told to buy a cheap one and give it a try.
Click to expand...
Click to collapse
Well I'm not holding out much hope as the new one they are sending is the same as the one I had prior to buying the new unit (ELM237) so will be surprised if it works.
Erisin ES350 Mini OBD2 ELM327 V1.5 Car Bluetooth Scanner Tool Diagnostic Android Car Stereo DVD
OBD2 Car Diagnostic Scan Tool
www.erisin.co.uk

Alondonboy said:
Well I'm not holding out much hope as the new one they are sending is the same as the one I had prior to buying the new unit (ELM237) so will be surprised if it works.
Erisin ES350 Mini OBD2 ELM327 V1.5 Car Bluetooth Scanner Tool Diagnostic Android Car Stereo DVD
OBD2 Car Diagnostic Scan Tool
www.erisin.co.uk
Click to expand...
Click to collapse
I got the same problem as you, can you update if this OBD works?
Thank you.

EggstarZ said:
I got the same problem as you, can you update if this OBD works?
Thank you.
Click to expand...
Click to collapse
Received the new OBD II from seller this morning and just bee out to try it, surprising enough it works. What I did do was delete everything off Bluetooth and made sure Bluetooth was off on phone so the only device was the new dongle. Bluetooth on stereo found it ok and paired, same as other, but this time when you selected it from paired and clicked pair it went red like phone does when you select it. Bluetooth in app found dongle and allowed me to select it but it wasn't communicating so I closed app. At the same time I deselected it in stereo Bluetooth but left it paired, opened app again and it worked. Dials are working and run a quick scan so looks to be ok now.

Alondonboy said:
Received the new OBD II from seller this morning and just bee out to try it, surprising enough it works. What I did do was delete everything off Bluetooth and made sure Bluetooth was off on phone so the only device was the new dongle. Bluetooth on stereo found it ok and paired, same as other, but this time when you selected it from paired and clicked pair it went red like phone does when you select it. Bluetooth in app found dongle and allowed me to select it but it wasn't communicating so I closed app. At the same time I deselected it in stereo Bluetooth but left it paired, opened app again and it worked. Dials are working and run a quick scan so looks to be ok now.
Click to expand...
Click to collapse
I got the OBD2 same as you got, tried to do the same process as you did with your headunit but no success on my side.
Do you know what kind of bluetooth mode you are using?
any one from the one iv'e attached picures from?
if you don't know you can got to factory settings and type "126", it should get you to the hidden menu.
what kind of MCU you got?