Develop Bugs

Downgrade Software version of TCL L55C8US Android TV

Good day,
I have got TCL Android TV model No. L55C8US with software version: V8-R851T02-LF1V252.011680
I want to downgrade software version to: V8-R851T02-LF1V187.008562
My questions are:
1- Is it possible?
2- Where can I get this version (V8-R851T02-LF1V187.008562)?
3- how can install the version into the TV?
Your feedback is highly appreciated.
Regards.

Yes. It's possible.
Celesw.tcl.com/Test/software/V8-R851T02-LF1V187.rar
Why to downgrade? There's v322 near by.

coolek33 said:
Yes. It's possible.
Celesw.tcl.com/Test/software/V8-R851T02-LF1V187.rar
Why to downgrade? There's v322 near by.
Click to expand...
Click to collapse
Thank you for your reply. My friend has got same TV with older version and my observation is the Brightness and 4K Videos is better than in latest versions.

coolek33 said:
Yes. It's possible.
Celesw.tcl.com/Test/software/V8-R851T02-LF1V187.rar
Why to downgrade? There's v322 near by.
Click to expand...
Click to collapse
Would you tell me how do I proceed with installing the software to the TV?
I downloaded the software file that has provided by you and I copied to USB flash drive after format FAT-32.
when I'm trying update local mode it shows error box, it says that No avaliable update file please insert USB device with software package.
I'm very sure that the USB is healthy and it's recognized by the TV.
Please help.

If it's in update.img format:
Hold power button on remote and choose power off. Or power off normally and und unplug the TV from from power.
Next with flash drive plugged to usb power on TV by press and hold the physical button on TV (not remote) until the led light on TV starts to flash. And wait.
It can question about older firmware so you have to agree.

coolek33 said:
If it's in update.img format:
Hold power button on remote and choose power off. Or power off normally and und unplug the TV from from power.
Next with flash drive plugged to usb power on TV by press and hold the physical button on TV (not remote) until the led light on TV starts to flash. And wait.
It can question about older firmware so you have to agree.
Click to expand...
Click to collapse
Thank you for your reply. I did exactly what you advised. But still it didn't proceed with the installation. Please find video url it would explain the problem.
https://drive.google.com/file/d/1PHLNzio6p7ntoYMe4xaqSxfQHeMLquDB/view?usp=drivesdk
Please advise.

Gohamad said:
Thank you for your reply. I did exactly what you advised. But still it didn't proceed with the installation. Please find video url it would explain the problem.
https://drive.google.com/file/d/1PHLNzio6p7ntoYMe4xaqSxfQHeMLquDB/view?usp=drivesdk
Please advise.
Click to expand...
Click to collapse
It's done! Software file (update.img) it has to be directly in USB-flash drive without sub-folder.
I recommend to install this version V8-R851T02-LF1V187.008562 instated of the latest one because the Brightness and 4K Videos is better and more clearly.
Thanks all.

Hi i recently buy tcl 55c8 model when i play any shows or movies it playback as smooth motion i have to disable it. I also trying to downgrade or update software and also try different picture settings like movie or judder reduction but still video play in smooth motion or with memc. If any one know how to disable it please let me know. and also audio and video are not in sync so please help me to sort out this problem.

Gohamad said:
It's done! Software file (update.img) it has to be directly in USB-flash drive without sub-folder.
I recommend to install this version V8-R851T02-LF1V187.008562 instated of the latest one because the Brightness and 4K Videos is better and more clearly.
Thanks all.
Click to expand...
Click to collapse
Hi you have the firmware file for this TV. Please share if you have thanks.

Ashsoni said:
Hi you have the firmware file for this TV. Please share if you have thanks.
Click to expand...
Click to collapse
All versions discuss here is very OLD !.
Look for latest firmware (V727) in this thread.....
TCL Android TV model 55p8m / Android Recovery TCL/BeyondTV/BeyondTV
My TCL Android TV model 55p8m has stuck and can't press any key in remote. The screen gives options to - Try Again - Factory data reset, but do not know how to select one of this option and continue without a keyboard or remote connected to the...
forum.xda-developers.com

@stasiof , thanks for reply this version will works for my TV? Model is tcl l55c8us.

@stasiof, I am not able find zip file can you share me link please.

I posted you thread where to look....post....#4,241
Edit:
V8-R851T02-LF1V727 OTA

TCL 65P815 firmware update problem and few things

Hi,
My problem is with 65P815. Fabric software was v084, i tried to update to V191 official version from TCL page, but after update and turning off TV, there is nothing shows on screen. I hear only sounds, and remote clicks, menu gone etc.
I search for info, and go back to v083 software, that helped and fixed TV. But now I don't know what to do to fix my TV. Tried to update with factory reset, nothing helped. Any tips how to deal with it ?
Next thing is concerned with soundbar thing, I have LG soundbar, is it possible to control soundbar over TCL's remote ? On my old Samsung TV it worked normally.
Here in TCL I don't see option to choose sound sourec (tv speaker/optical/hdmi), there is no option to mute TV speaker and move sound to soundbar. For now I use 2 remotes, but I want to use only one like in Samsung. I connected soundbar with optical cable to my TV.

Hi there. Trapped into same thing. After flash, I can hear 'bing' when you navigating in menu, backlight is working, but screen still black. Tried to flash V191(Inserted stick to USB2.0 with Update.img and plugged in with power button pressed). But got same thing. Led is blinking during i suppose flashing, but after that - nothing. Can it be somehow reset to stock or whatever?

you have to go back to 0.83
Turn off the TV, plug out the cable. put the drive into usb 2.0, press power button on TV's back and plug in power cord, if led start blinking wait about 10 mins to finish flashing. Sometimes you have to do this twice and TV will be ok.
Write to TCL support about your problem, let them prepare patch

Hmm... I have couple of questions then.
Does that mean v083 firmware didn't published somewhere?
And does that mean that we can't update 65p815 to any new firmware with Android 11?

what was your native FW ?
I tried to update to V191 which is on android 9, and update was failure. There is something wrong with the FW
File upload and sharing. Large file transfers. Free online cloud storage.
Visit this link to download: V8-R51MT02-LF1V083.zip
files.fm
here you can find v0.83
Android 11 is in beta now, we have to wait for official final update

I didn't check my original fware version. I know that was very stupid, but i supposed that just platform is matter.
Thanks for link. Will try this fware. Hope that will help, because i don't like to waste time with support, that usually just redirects to another operator...

it should, try second time if the first will failure

Ok, i just finish downloading and i'll start bring that baby to life. Thanks for help. Will report if suceed.

report it to TCL support to make technical request, and to fix that firmware

Ok. Just flashed twice. God damn, you have been right! All works like charm!
If someone will be as "lucky" as me, steps are next:
1. Load to local pc zip from above.
2. Format flash stick with FAT32 and copy it to root.
3. Insertt stick into USB 2.0 port.
4. Turn off TV power physycally.
5. Press and hold On/Off button on a TV's back and plug TV holding button pressed.
6. Hold for 10 secs, the led in front of TV will start blinking - it is ok.
7. Wait till it will stop blinking and wait some 5 mins after that.
8. Repeat steps 4-7. After TV restart it will show TCL logo and Android welcome screen will appear.

Ok now we should think about how to flash properly new version of FW,
latest official firmware is
https://www.mediacenter.tcl.eu/uploads/common/R51M_Android_P_V191.zip
When I try to flash with it, from menu update/local it works but only first time. When I turn off TV, then screen is black
I found such instruction, what to do after installation
Press the Settings button in the remote control:
Press OK on the icon: Picture.
Then go to the line Advanced settings.
Scroll down to the line: Brightness settings.
Scroll down to the line: Contrast.
With the remote control, do the key sequence: 6 4 2 5
The special menu appears.
Go to the line “Reset All” and press OK.
Go to the line “Reset Shop” and press OK.
Now unplug the main power cord.
Wait for ~2 minutes.
Plug back the main power cord and perform complete installation.
Click to expand...
Click to collapse
but haven't tested it yet.

Guys, can you post "Project ID" of your P815?
As ,for firmware V191 supose to be as attached....
50P815.....285
55P815.....284
65P815.....283,305
TV panel type can be found in service menu.....Main menu (1950)...

Just grabbed my panel name.

stasiof said:
Guys, can you post "Project ID" of your P815?
As ,for firmware V191 supose to be as attached....
50P815.....285
55P815.....284
65P815.....283,305
TV panel type can be found in service menu.....Main menu (1950)...
Click to expand...
Click to collapse
Seems on mine 65P815 by your table, the code should be ST6451D02-3 (code 305), but i have ST6451D02-H (code 283).

I have flashed v272 (img file) from v084 to my 65P815. Flashing went smoothly with no black screen ecountered. v272 works nicely with no problem.
TCL Android TV model 55p8m / Android Recovery TCL/BeyondTV/BeyondTV
My TCL Android TV model 55p8m has stuck and can't press any key in remote. The screen gives options to - Try Again - Factory data reset, but do not know how to select one of this option and continue without a keyboard or remote connected to the...
forum.xda-developers.com
@ancifil said:- "Did you reboot your TV after that?"
Sure I had rebooted it after flashing as I have been using this firmware for about a month.
I remembered flashing it 2 times. The first time was not successful (can't remember due to what). The second time reflash (same as what you did as in post #10) was smooth and without any problem.

jngiag, looks like it should, as for me... Maybe, i shall try 272 one more time.
superfly86, did you try 272?

jngiag said:
I remembered flashing it 2 times. The first time was not successful (can't remember due to what). The second time reflash (same as what you did as in post #10) was smooth and without any problem.
Click to expand...
Click to collapse
Btw, one thing. Can you remember, after you had flashed 272 first time and after that launched flash menu, to flash second time, was you able to see menu?

ancifil said:
Btw, one thing. Can you remember, after you had flashed 272 first time and after that launched flash menu, to flash second time, was you able to see menu?
Click to expand...
Click to collapse
I think it was due to a request to input pin while I was trying to setup live TV. I did not know the pin so I powered it off and reflashed as in post #10. Sorry, I can't remember it exactly.

ancifil said:
Seems on mine 65P815 by your table, the code should be ST6451D02-3 (code 283), but i have ST6451D02-H (code 305).
Click to expand...
Click to collapse
Your 65P815 with panel ST6451D02-H...... Project ID MUST be 283.
This is your problem with firmware (black screen ) !
So you need to change ID number from 305 to 283.
To modify the project ID, when TV is ‘ON’, with the remote control do the key sequence
0 6 2 5 9 8 .....MENU.... 283.
At the end of the key sequence the TV must reboots alone if the project ID has been understood by the TV. If it doesn’t, update the product with the last software available and try again.
Sometimes several tries can be necessary for successful project ID modification.

stasiof said:
Your 65P815 with panel ST6451D02-H...... Project ID MUST be 283.
This is your problem with firmware (black screen ) !
Click to expand...
Click to collapse
I've got that. But the hard thing is that i will not see this manipulation... I have to do that blindly. Risky stuff, right?

Thomson 55ud6406 boot loop

asking for help accidentally in the programming options, I activated the indicator, the TV turned off and the android logo is still there
I've already won various updare pendrives but after the update is complete, the android logo is still there. Is there any way to get into recovery? to make a short circuit on the motherboard?

MT58 platform......
read here:
Downgrade File for TCL C6 (Current Version: V8-T658T01-LF1V534)
Hey guys, I am new to the Android TV scene so bear with me. Recently bought TCL C6 TV. It updated yesterday to Android Oreo but the Color accuracy especially in HDR has fallen considerably, constant dimming of backlight for no reason and not to...
forum.xda-developers.com

I have read anything that I would not have uploaded, it will not reset the TV settings for me, do you have an idea?

grzechu023 said:
I have read anything that I would not have uploaded, it will not reset the TV settings for me, do you have an idea?
Click to expand...
Click to collapse
You need TV to work back or worry about not to reset TV ?
First try to unplug TV from power socket and after 10-15 min plug back .
If not,you nee to flash PKG file, to boot normal again.

I have already tried and you have nothing on a 100% working pkg file, each I uploaded the TV stops on the android logo after 4 hours the same

Soft locked my Android TV?

So...
I was dumb enough to play with the developer options hoping to find an option to deactivate adaptive screen resolution. instead i clicked on something and now my tv is kinda soft locked. at first it was stuck in a boot loop, eventually went into recovery mode here and there (see attachment, maybe there are some informations that could help solving the problem) , but i couldn't select/press anything bc this tv only has a power button. Later i found out you can use an USB keyboard to select stuff in recovery mode. So i grabbed my keyboard and waited for the RM screen. but it wouldn't show up. idk why but now its booting "normally", even shows the android logo. but then its just black. eventually the TV turns off and then back on, over and over. i tried every button combination I could find on the whole internet. Nothing seemed to work. One combination got me some hope but that hope disappeared quickly: i unplugged the TV, held the powerbutton, plugged the TV back in, still holding the power button, and waited.
after a short time it showed me a monitor looking like symbol with a gear icon on it and the gear was crossed with a red X. under it it was saying "error". (see attachment) ("Fehler" means "error" it's german)
so here i am. idk how i get it back into recovery mode so i can try that keyboard method.
and since i got that TV from my gramps, I don't have much information about it either. just got the TV and the remote from him.
I just know that it's the TCL 43EP640 respectively 43EP640X1. (Theres a sticker on the back of the TV, see attachment) so yea. I've heard you can update the firmware/software using an USB stick but idk how and i couldn't find any firm-/software for this TV
If you've read to this point and have an answer to my problem: I Love you

Need to flash with any IMG software (firmware) file....
Latest.....
Android 9....V662
Android 11...V715
Search in this thread...
TCL Android TV model 55p8m / Android Recovery TCL/BeyondTV/BeyondTV
My TCL Android TV model 55p8m has stuck and can't press any key in remote. The screen gives options to - Try Again - Factory data reset, but do not know how to select one of this option and continue without a keyboard or remote connected to the...
forum.xda-developers.com

stasiof said:
Need to flash with any IMG software (firmware) file....
Latest.....
Android 9....V662
Android 11...V715
Search in this thread...
TCL Android TV model 55p8m / Android Recovery TCL/BeyondTV/BeyondTV
My TCL Android TV model 55p8m has stuck and can't press any key in remote. The screen gives options to - Try Again - Factory data reset, but do not know how to select one of this option and continue without a keyboard or remote connected to the...
forum.xda-developers.com
Click to expand...
Click to collapse
i truly have no clue how to do any of these. could you help me out? explain to me like I'm 5

prixtn said:
i truly have no clue how to do any of these. could you help me out? explain to me like I'm 5
Click to expand...
Click to collapse
Please, take time and read in forum I posted...thx.
Edit:
Sample for same thread......#3,725
You need to flash IMG file

stasiof said:
Please, take time and read in forum I posted...thx.
Edit:
Sample for same thread......#3,725
You need to flash IMG file
Click to expand...
Click to collapse
but where do i get the firmware files?

prixtn said:
but where do i get the firmware files?
Click to expand...
Click to collapse
In that thread, everything is there.
Use search function....type... V662 or V715 and you will found.

Tcl C715 tv frozen after installing mullivaf vpn

Tv home page frozen, unable to access anything, remote doesn't work. Have fetch box attached able to use via manual switch at back of tv. Fetch has separate remote. Very desperate for help. Thanks in advance

Edit error: Mullivad vpn

Have you tried resetting TV? This may help.
https://www.google.com/url?sa=t&sou...oQFnoECBcQBQ&usg=AOvVaw3p7saJhLWrZQFBmV2-cQqd

RAMBO29 said:
Have you tried resetting TV? This may help.
https://www.google.com/url?sa=t&sou...oQFnoECBcQBQ&usg=AOvVaw3p7saJhLWrZQFBmV2-cQqd
Click to expand...
Click to collapse
Not able to do anything only using button to choose HDMI settings. Tried removing plug from socket. Also removed batteries from remote but still frozen

What firmware is installed ?
Flash firmware with IMG file for C715.....(R851T02 platform).
Anyway ,you should post in that thread....
What is your region/country ?

stasiof said:
What firmware is installed ?
Flash firmware with IMG file for C715.....(R851T02 platform).
Anyway ,you should post in that thread....
What is your region/country ?
Click to expand...
Click to collapse
Australia, which thread? Àpologies for not knowing my way around this site.

C715 thread....(last page)...
TCL Android TV model 55p8m / Android Recovery TCL/BeyondTV/BeyondTV
My TCL Android TV model 55p8m has stuck and can't press any key in remote. The screen gives options to - Try Again - Factory data reset, but do not know how to select one of this option and continue without a keyboard or remote connected to the...
forum.xda-developers.com
You have there last IMG firmwares...
V662...Android 9
V715....Android 11
R815....Android 11 custom