yashsingh1/xdaforums huggingface dataset:
[Android Head-Units] Hazard15301:
Glad everything worked out for you! I reached out to my seller again but judging from our last conversation, I doubt he's ready and willing to admit fault just yet. I presented him the facts and he sort of skirted the issue. I wonder if you can just buy the right chip online somewhere and swap it in?

*edit

You can get it on Digipart apparently, dirt cheap.

https://www.digipart.com/part/GL852G

---------- Post added at 02:34 AM ---------- Previous post was at 02:33 AM ----------

It's a few pages back in this thread.
[Android Head-Units] erkme73:
How long have you had yours? I think a very valid argument could be made that they sold you a defective good - one with a known design flaw. His email to me stated:

I imagine he's in a very difficult spot, but the reality is, HIS supplier provided him with a systemic problem. He's admitted as much to me. Fortunately I was still within the return window.

Did you buy it with a CC that might have some kind of consumer protection/insurance? It's pretty well documented that this is something more than a one-off dud, or operator error.

As for replacing the chip, I spoke with my brother - who is an electrical engineer. He said that without a solder station it would be very difficult to not end up with one very big pin on either side of the chip. You'd have to have the proper solder, and just the right temp/type of iron to make that work like it did in the video. And one mistake, and you'll need a new board.
[Android Head-Units] Hazard15301:
I bought it in August, and I just went back and reviewed the listing. It does state they offer a 2 year warranty. I'm happy with the Tasker fix but I'm looking to trade this one in again because it's starting to develop problems getting a GPS fix.

You're probably right about swapping that chip. That video made it looks effortless, but I should know better.
[Android Head-Units] erkme73:
Yikes. Not happy to read that other issues are surfacing. Are you sure your GPS antenna hasn't shifted? I have mine installed inside the dash, stuck to a metal support pipe. Works great, but I can see over time that it might move a bit. On the upside, I did buy the recommended 4-year amazon insurance policy, for whatever $$ that's worth.

I did find one 'gripe' about the new unit. When in recovery mode, I could navigate the menu with the pin-hole reset button (on the last unit I shipped back). This new one instantly resets/powers-off/reboots the second I press it (like the first unit did). That means I cannot navigate without installing a keyboard. A bit of a pain, aside from installing the rooted rom, I don't foresee using that often. Does make me wonder if there isn't a setting that defines how that button behaves.
[Android Head-Units] Hazard15301:
Nah, I have it mounted on the dash, in direct view of the sky. I checked the antenna connection and it's tight there as well.

I think I called it right on the money with the seller. Here's the latest from him:

Dear customer

OK， good news, are you good handy , I willl send you a video show how to exchange the wifi &bluetooth module, last time I only applied the bluetooth module , maybe cnanot fix the problem, this time will apply a wifi &bluetooth module can you fix it your self , please check your email later , if yes I will apply for you , if no , I can apply a mainboard for you , that will be easier but more expensive.

Now, this is the chip he sent:

If you can't make it out, its the RTL8723BU. Now, I know from the contents of this thread and others that this is an integrated wifi/bt chip. So why is he trying to sell me on a separate chip?

Other than this thread and the 4PDA thread, is there any more proof that I can send this guy to plead my case?
[Android Head-Units] erkme73:
I think we've pretty well established that the problem is NOT with the wifi/bt chip, but rather the IC that is driving the USB hub - hence the dropping of the USB on the front going out when the wifi/bt are out.

If your seller is the same is mine, then he is either highly misguided, or he has selective amnesia. If he's offering to swap out the main board with one that has the new 852 chip on it (as in the pic a few posts up), I'd jump all over that.

The biggest problem is with the language barrier. What I did before sending anything to him, was to translate everything into Chinese (google translate) and then back to English. It never read right the first time. So I'm massage the wording (using simpler terms) until the re-translated English version had the proper meaning - then I sent that. Don't know if that helped, but it seemed to work.

I'd insist that we know it isn't the radio. Ask him if he can ship a new main board (not the android board) with the latest GL852G IC on it - maybe even send him the photo:

XRC = bad GL850 chip.
[Android Head-Units] erkme73:
Or, if you're really daring: https://www.youtube.com/watch?v=QiIy3Oe2UGI
[Android Head-Units] Hazard15301:
Nope. I have plenty of $200+ dollar paperweights, I don't need another.

You seem to be right about the language barrier. He just emailed me that same video about replacing the GL850G. So obviously he didn't mean a "wifi chip".
[Android Head-Units] MoSH89:
So they sent you the player with the chip changed after you tell the seller about it or they realized about this mistake?
[Android Head-Units] MoSH89:
The fix is that with Tasker?
[Android Head-Units] psyko_chewbacca:
To be fair, this video shows how to solder a IC that has way narrower pitch than the SSOP-28 package of the GL852G IC.

Don't get me wrong, removing and soldering in the new GL85xG IC is still a job for intermediate soldering skill level but it's nowhere near as hard as soldering (what looks like to be) a TQFP-100.

A way around desoldering the faulty IC could be to individually cut each leg of the IC using a very fine and precise cutter.

For my part, I have the necessary equipement and skills to pull this mod easily. I'll try to capture a video of it while doing it if that interests anyone.

I'm waiting for the replacement IC to arrive which could take some time tho.

I'm begining to consider going the DSP mod while at it. Is it still relevant to do so now that there is a completely software solution. I'm still rocking the stock speakers in my 2008 Yaris so I'm not sure I'll see any difference with the hardware mod.
[Android Head-Units] crazybird82:
RTL8822BU could be working. Or a more little ones like that what is original inside ... The RTL8822BU would be nice with more powerfull wifi and better bt (4.1).
[Android Head-Units] marchnz:
Refer schematic. USB hub IC is not connected to RTL(md725) BT/WIFI module as is connected directly to the SOM..

Issue is likely to be +5v switching circuit, which also supplies the GL850/852 USB Hub - has anyone traced or tested the 5v supply to the MD725 when the problem happens? Use freeze spray and a hairdryer to assist in testing....

Just to be clear: GL852 USB hub is NOT the problem - I read alot of guessing without valid testing.
[Android Head-Units] Hazard15301:
b-max's explanation regarding the temperature issue: (This is ran through google translate, so it's not 100%)

In support of [MENTION=1143298]psyko_chewbacca[/MENTION] 's case above, my seller has also agreed to send me a new board, with the GL852G chip installed.
[Android Head-Units] marchnz:
Great response - apologies for assuming the XRC units were as MTCD, where WIFI directly attached to SOM.

I would disagree with assumption re. voltage regulator stabilising, more likely the supply 'switch' on, or insufficient switch on voltage of caused by a component affected by cold.

re. +5v; from MTCD schematic the MD725 is supplied by +5, then LVDO (ams1117cm-3.3v) droped to 3v3 (switched by SOM). The GL850 is supplied separately to the MD725 (at least in the MTCD) by MCU switched +3v3 (SYS3v3).

I suggest checking - if the XRC have separate 3v3 supplies as standard 'mtcd' (use ohm meter to check between MD725 and Gl850 supply pins) - using the steps to replicate the fault - with two multimeters - one at MD725 and one at GL850 - could be a problem with either one of those or the switching thereof.

Also a has anyone tried methodically - going around the board - with freeze spray to locate defective component?
[Android Head-Units] erkme73:
Wohoo! That's great news, brother. I am so happy for you. Is he charging you anything for the swap out?
[Android Head-Units] psyko_chewbacca:
No worries. I was the first to assume the MD725 module was the problem at first.

I don't think there's that much problem with the regulator situation. If it was the case, I suppose there would be far more components exhibiting issues due to cold. Of course, the board is probably populated with regulator ICs that have been selected more because they are cheap than reliable!

These are cheaply produced units after all. Plus, even when the Wifi/BT module isn't detected, the faulty USB hub does come up, so it's powering up at some point, it's just probably bugged in some weird state when waking up.

I've seen this kind of stuff happen, it's not unusual on "poorly" designed PCBs with "problematic" devices.

A fix that

might

work would be to place a capacitor between the "RESET#"(pin 13) signal on ground on the GL850G. Something like 1uF and maybe replace the pull-up resistor (if any, I hope there's one) with a higher resistance one. This could delay releasing the USB IC from RESET a couple extra milliseconds to let the power stabilize for a bit longer. But that's all depending on what component is already on there.
[Android Head-Units] Hazard15301:
He hasn't mentioned it, he didn't even ask for me to send the old one back. I would put up a fight before paying anything, though.
[Android Head-Units] MoSH89:
So its work with the new chip?
[Android Head-Units] erkme73:
100%!
[Android Head-Units] marchnz:
Absolutely agree. Just looking at the 850 and 852 datasheet - the Power On Reset must be timed (by RC network) to reset after power supply is stable.

My hunch is that the Reset line resistor to +3v3 or capacitor to ground value is incorrect/copied from gl850 which has a +5v supply.
[Android Head-Units] MoSH89:
Great. I hope to find someone to change my chip when arrive
[Android Head-Units] sean19661:
I'm running malayk rom 3.1.2

When I check the box in tasker I get message no root also I can't find white listening tasker anyone running his rom and had any luck setting up tasker with the script?
[Android Head-Units] Hazard15301:
I replied to this the last time you asked this question.

Root access is built into Malaysk's rom, so it sounds as if you did not grant access to Tasker when it initially requested it. You should go into your SuperSU settings and clear any entry for Tasker, run the script again, and grant root access when it is asked for. As far as whitelisting goes, you should read the instructions on Malaysk's thread. I believe you have to manually add it to an .ini file.
[Android Head-Units] sean19661:
Sorry if i asked this before Hazzard but I don't see supersu that I can recall also if you could be kind enough what entry need to be put in the ini file I'm dearly new to the HU scene always been fimilar whit our phones .

I'm so sorry. Any guidance would be most appreciated

Thank you for the reply. [emoji17]
[Android Head-Units] Hazard15301:
You'll have to read Malaysk's thread, I don't have it installed so I'm not sure what the exact process is. I do know that he explained over there how to do it.

As far as accessing SuperSU, I believe it's hidden in Malaysk's rom, you might want to ask in his thread for more help with that.
[Android Head-Units] sean19661:
I appreciate you getting back to me on this I have read all his post and can't seem to find anything thing on it also tasker never ask for supersu permission might be my problem also not being able to whitelist tasker can't find where whitelist is located maybe I might go to HAL900 rom instead and have better luck ?
[Android Head-Units] Hazard15301:
Malaysk incorporates xposed-mtce-utils for whitelisting. Thread is located here.

Also, here is a reported fix for Tasker not being granted root access in Android 8.0. Found that in Malaysk's thread as well. Start a terminal and type
[Android Head-Units] Fallenwitcher:
I bought a 7491GE from Ebay. Its a PX5 Device with the same WiFi/BT bug. Can someone say me which Update i have to install and where i get it? I hope an update can fix it.
[Android Head-Units] Hazard15301:
There isn't any update that will fix this, other than updated hardware.

All the info you need is in this thread. Start on page 7 and work forward.
[Android Head-Units] Fallenwitcher:
Okay, that's not good. Is it possible to use a Bluetooth stick to replace the build in one? WiFi isn't necessary but Bluetooth is important for hands free calls. I have a usb for WiFi/Mobile Data and for usb flash Drives. Can I connect the dab, dash cam and Bluetooth stick on one usb port?
[Android Head-Units] Bose321:
I have an issue driving me nuts. Is it the same problem as here? https://xdaforums.com/android-auto/mtcd-software-development/usb-connection-issues-t3874649

Basically my USB ports fail to work most of the time. Today I drove my car and it started to work after like 30 minutes. It's so annoying... The shell script posted here that is said to restart the usb hub doesn't work. Also an app to reset the usb device doesn't work.
[Android Head-Units] Belindor:
I am facing similar problem to this. Here is the video on youtube I uploaded. https://www.youtube.com/watch?v=ysQYn9B-a-Y&feature=youtu.be

https://youtu.be/ysQYn9B-a-Y

I am using ROM I installed from https://xdaforums.com/android-auto/...head-units-t3741583/post78398166#post78398166 thread. However, WIFI had the same problem even before installation, I decided to do new firmware to fix that, but problem is still the same.
[Android Head-Units] psyko_chewbacca:
I just updated the title of the thread and added link to a post in this thread that explains the problem, the resolution process and the fixes available.
[Android Head-Units] ruboncio:
Hello,

I don’t think I have the same storage path than you.

My unit is mounted with “Flash” (I put sh the file in the root of this flash folder) but it doesn’t seem to be working.

In USB host controller I can see I have 4 mount points:

-/mnt/sdcard/ehdd

-/mnt/sdcard/ehdd2

-/mnt/ehdd/

-/mnt/sd-ext

Any idea of how to map the file properly?

Thanks
[Android Head-Units] Bose321:
Would it also be possible to get a hardware fix? The software fix doesn't work for me most of the times. The problem indeed occurs mostly in the cold. The only difference is that I have a GS unit, but maybe they're the same in hadware. The weird thing is that last year I went to Germany for a week and it was freezing, and I didn't have any issues. Now it's around 0 degrees C and I have a lot of problems. The funny thing is that it seems to be a lot less without my simple USB hub connected... Worked fine for 2 years... The USB hub does get power because the LED is on, and the USB connected to it as well, but nothing in Android.
[Android Head-Units] Hazard15301:
The answer to this has been extensively discussed here. You would need to swap out the GL850 chip with a GL852G, which isn't an easy task for someone without experience soldering small components.

As promised, my seller has sent me a new board, with the GL852G chip installed. If it isn't DOA, I'd say my troubles are over.
[Android Head-Units] Bose321:
Cool. Let me know if that solves it. How much was that board? Looks pretty different from mine...
[Android Head-Units] Hazard15301:
My radio is still under warranty, so my seller sent it free of charge after convincing him it was a manufacturer defect.

So if anyone is still following this, I wanted to share some information that might be relevant. The new board does have the GL852G chip as promised. However, the RTL8723BU chip has been replaced with the RTL8188ETV. This is the first time I've seen or heard mention of this particular chip. This chip doesn't utilize an external antenna wire (or maybe it does, but the seller didn't attach it).

*edit - This is because it's not an integrated wifi/bt chip. Wifi only. They've added a dedicated BT board, info at the end.

Side by side comparison:

Close of of new chip:

New USB host chip:

*edit - New BT chip.

Sticker taken off the new chip, can't find any info on this one:

Bluetooth isn't working, but I think that's because it's still set to MD725 in factory settings, and I don't know what the correct setting is because I can't find any info on the chip. I'll play with it some more later today.

*edit - It's a BC6130

**edit - The correct setting is the one that has BC-6 in it.

I don't know why XDA is flipping the pictures upside down, but I can't seem to fix it.
[Android Head-Units] Bose321:
Interesting. Dedicated WiFi and BT chip sound like a good thing! I'm wondering if it also fixes the many problems people are having with it. I would love a board like this one with better chips onboard.
[Android Head-Units] Seicane-Misery:
Need the newest FW for my Seicane head unit please!

Hi,

Does any of you guys have the latest (newest) firmware from seicane seller/s? I have bought this; MTCE_MX2_V2.94_1 on 8 core 64-bit coretex-A53 @ 1.5Ghz.. 2 weeks ago and I have been in vain for a week now trying to contact them through the so-called support and asked them for the fourth time for the newest fw but I get a crazy reply back from them:

we don't suggest the customer to upgrade the unit because the system will be chaotic and some functions may be not available.

It seem to be only they sold the car headunit to the costumer and he may never updated to a newer fw or to have it as an backup, them support for this seicane car headunit is zero / 0 .. i need it as an backup in case that i like to go back to it after trying some custom rom.

if you have any download link to the newest fw upgrade for seicane headunit, not that old one on yadi.sk, and you like to share it? that will be very kind from you guys!

thank you in advance.
[Android Head-Units] Hazard15301:
Yea it definitely solved the issue. Wifi comes on immediately on boot, and bluetooth shortly thereafter. No delay at all. The only problem now is that the new board needed the physical buttons remapped, and the volume knob is no longer being recognized. There doesn't seem to be a way to remap the knob from the factory menu, so I might need to hunt down another MCU version that works. The one that came installed seems to be new, I don't recognize it.

*edit - FIXED! I had to go into factory settings and change the knob setting to 10k/20k and it works again.

I also meant to tell you, if you're comfortable soldering small components, you can swap the GL852G chip into your current board. There's a video in this thread showing it being done, and the chips are available online for under $10. The size of the pins is what turned me off to the idea. Somebody was talking about doing it, but I never heard if they did.
[Android Head-Units] MoSH89:
I'm waiting to receive the chip... I've found a guy thar have all necessary things for changing the chip.
[Android Head-Units] austinman:
Hello,

I applied this fix to my dasaita head unit because my USB ports are not working in cold morning (below 0°C). Fix works fine except on cold boot. I have to power my HU off then on and then the tasker script launches.

What did I miss ? Or is it normal ?

Thanks for your help.
[Android Head-Units] Bose321:
Fix doesn't work for me, but using the USB controller app to reset the hub works. BUT only when I disconnect every USB device connected, and after running the HU a few minutes. Any idea?

Does someone have an address to buy a new chip? Really annoying problem.
[Android Head-Units] xdamember2:
I bought some GL852G chips at Chipmall.com and replaced the GL850G in a unit that didn't have working USB below 50 degrees F. Replaced the chip today and it tests good down to at least 8 degrees F. On another unit I'm using the software fix, it usually works but I know it failed once.
[Android Head-Units] austinman:
Upgraed to hal9k 3.1 ROM and it works on cold boot now with the implemented usb fix.
[Android Head-Units] xdamember2:
I've been using the software workaround presented in this thread for a day now and have no problems - although the coldest it ever gets here is right around freezing. I made a couple of changes from the instructions. I removed the "sleep" commands, I am sensitive to startup delays. And instead of making a script file, I put all the commands in one Shell action in Tasker. If you go that route, it is necessary to add a ";" after each.

I also replaced one ic with a better one that has a wider temperature range. Not sure if that was necessary. And I ordered a replacement for the hub chip, but it looks like there's no reason to install it. Yet I may do so anyway.

I tried an experiment, replacing the tiny crystal with one in a can. That seemed to make things worse, it wouldn't even work at 50 degrees. I'm waiting for one with a wide specified temperature range and the proper load capacitance.
[Android Head-Units] 1Plus1:
Problem Fixed

I confirm that the change of the motherboard that includes the GL852 chip completely resolves the problem.

My Seller on AliEx sent the new motherboard free of charge following a claim made outside the 15 days after receipt of the product.

Simply contact him by chat and explain that the XRC motherboard V1 presents major problems connecting to the BT/Wifi when it's cold.
[Android Head-Units] Cpawannabe424c:
1Plus1- how hard was it to swap out the board? Also received defective unit (wifi and bt issue) last week from Ali Express seller. My plan is to have them send me new board.
[Android Head-Units] gforums:
While I had only few problems with usb drops, the problem now occurs too often. I still have the software fix enabled, but my usb (mainly used for digital radio) dropped every five minutes or less within the last two days.

Still my seller and company WITSON do not confirm the issue, meaning I can't get a working replacement.

I ordered some gl852g chipsets and soldering stuff (also some training boards) but still I fear doing the replacement on my own.

Probably using a Mainboard from another manufacturer wouldn't work? WITSON wrote me, that they first are going to use and sell their stock before boards with new chipsets will be available.

And they said that they are not aware of many issues caused by this usb chip.

Really frustrating me...
[Android Head-Units] 1Plus1:
It's Simple to change the motherboard on Head Unit. Only few crews for have Access to the motherboard.
[Android Head-Units] Alexander_Kwame:
Hi

I think I have the same problem.

if I install the Hal9k ROM can I fix the problem without replacing the chip?

thanks
[Android Head-Units] psyko_chewbacca:
In my case it works most of the time but it's not 100%. Maybe having a tasker profile of this fix (tutorial somewhere in this thread) you can toggle on demand would help resolve those rare times.
[Android Head-Units] gforums:
[IMG="GL852G"]http://www.gforums.de/daten/gl852g.jpg[/IMG]

Received the GL852G chip and replaced it. So far no USB drops the last2 days. Looks promising!
[Android Head-Units] Alexander_Kwame:
Me too!
[Android Head-Units] MoSH89:
How it's the connection to BT after replacing the chip? I've changed that chip and sometimes it's connect fast, sometimes it's connecting in 1-2 minutes and sometimes won't connecting at all.
[Android Head-Units] abergonados:
ajutor

salut sint din focsani,ma poti ajuta cu detalii cum ai inlocuit cipul?
[Android Head-Units] gforums:
I didn't have any issues after replacing. Always bluetooth in connected within some seconds for me!
[Android Head-Units] gforums:
A short update from me:

I have much less usb drops with the gl852g chip, BUT still rarely usb is disconnected. Can anyone confirm this behaviour? Any other potential hardware fix?
[Android Head-Units] MoSH89:
After reset its working the BT but not all times. It's connecting all most of the time but sometimes won't connect and after I stop the engine and start it I can connect to BT. Witch can be the problem?