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

U65X9006X1 TCL / start error- boot im

Hello everybody,
I have a problem with my Android TV.
TCL
U65X9006X1
The problem is it won't start completely.
After switching on, the TCL symbol appears normally, then a symbol with a red X, and now the animated Android TV symbol and that's it.
The Android TV animation runs on and on and on at some point after about 1-2 minutes the animation is gone and now nothing happens.
you can only see that the backlight is still on, but nothing else happens.
I can start the firmware update via USB and it apparently works, but then the same problem.
The device has only one control stick on the TV with which you can only execute one command at a time.
Do you know how to get into Android Recover?
Is there any other idea?
what can I do? Guarantee is over.
My english is not enough so i have to use google translater.
thanks
greetings from Germany
marcC78

Which firmware you using on USB ?

Hello,
...v574

OTA or PKG ?
V8-T658T01-LF1Vxxx ?

what is the difference?
I downloaded the original firmware from the TCL homepage.
V8-T658T01-LF1V574

Something prevent you to boot, so need to clean your TV with fresh update, which will wipe all your programs inside.
Please refer to this thread:
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
V574
Simple question I asking it's zip file or update.pkg ?

.zip

marcC78 said:
.zip
Click to expand...
Click to collapse
At least I get your answer.
Zip file(s) wan't help ,so try reflash with .pkg file (power button).
Flashing with pkg file, will wipe all your apps ,settin, etc....
You can found pkg file in thread I posted earlier.

Hello,
why shouldn't I answer?
I somehow managed to start the RecoverMenu, reset everything there and now it starts normally again.
I'll try to reproduce it and will report.

OK,good.

hard reset / troubleshoot TCL 50C715

Hi,
my TCL 50C715 is curretly dead. It started to make weird noises, would not turn off anymore and after I unplugged it the home-screen in more or less empty and the few remaining icons (among them the settings-icon) don''t work anymore. Unfortunately the only documented way to do a factory reset is using this menu, so currently I am stuck.
Does anone have an idea what the problem could be or how to accesss the recovery on this model?
Many thanks!

First of all you should post in deducated 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
There you look for IMG (recovery) file to flash.
Btw,
you should post also your present firmware.

How can a thread dealing with the p8m models be the proper thread for my c715 model? Are you sure?
And I don''t know the current firmware and cannot look it up as my tv has become unresponsive...

If the clear the system cache is on the boot menu you can try that first along with a hard reboot (simulates pulling the battery).
Otherwise the easiest quick fix is factory reset... if it works... it usually does unless the root cause is hardware.
It maybe a virus or rootkit...
In pre Pie OS versions there are rootkits that can survive a factory reset, a reflash is needed to kill them if the factory reset fails to.

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.