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[Q&A] HELP - Downgrade issues

hello all, my friend owned ATT atrix 2 , ithink it using
http://sbfdownload.droid-developers.org/edison/InlineFlashing_Edison_67.21.125_CFC_P3_APBP.xml.zip
Click to expand...
Click to collapse
he want to flash sbf asia verison
http://sbfdownload.droid-developers.org/edison/6.7.2_EDEM-18-SEARET_cfc.xml.zip
Click to expand...
Click to collapse
but when it flashing , "fail" error message appear
reach at Level 7 it Become "fail"
mean it can't flash the asia version
any help?

guffoe said:
hello all, my friend owned ATT atrix 2 , ithink it using
he want to flash sbf asia verison
but when it flashing , "fail" error message appear
reach at Level 7 it Become "fail"
mean it can't flash the asia version
any help?
Click to expand...
Click to collapse
You can't do that. AT&T phones can ONLY use AT&T firmware. This had been said repeatedly all over this forum. If you and/or your friend would have bothered reading a little you would know that already. Next time read everything related to your (or your friend's) phone. Then read it all again, and even if you think you understand, read it again. Make EXTRA sure you know what you are doing before you do anything. That being said, try to flash the FXZ from the first link you posted. That is, if the phone hasn't been bricked already. If that doesn't work then I'm afraid your friend now has an expensive paperweight. I hope your friend is a nicer guy than I am. Good luck!:thumbup:
Brought to you by time and relative dimensions in space.

You can flash that on AT&T.
!WARNING! This metod is only for advanced users... If don't know what is CID. Don't flash that files!!!
OLD MY POST (to prove that metod is working on AT&T A2): http://forum.xda-developers.com/showthread.php?p=42246899#post42246899
But I don't recomended that... And also DON'T TRY TO FLASH RETAIL A2 FW VIA RSD EVEN WITH ERASED CID!!!

turffe said:
You can flash that on AT&T.
!WARNING! This metod is only for advanced users... If don't know what is CID. Don't flash that files!!!
OLD MY POST (to prove that metod is working on AT&T A2): http://forum.xda-developers.com/showthread.php?p=42246899#post42 246899
But I don't recomended that... And also DON'T TRY TO FLASH RETAIL A2 FW VIA RSD EVEN WITH ERASED CID!!!
Click to expand...
Click to collapse
What exactly do you by the method is "working on AT&T A2"? I watched the YouTube video you linked in another post and saw the phone boot up, but then I appears that it is showing an error message.(possibly a force close of some sort. Sorry, I can't read whatever language that was in) Then the video stopped before showing the phone in a usable state. Can you provide verification that the phone is usable after doing what you are suggesting? I ask because to me there is a difference between booting up to endless force closures and booting up to a useable phone.

1BadWolf said:
What exactly do you by the method is "working on AT&T A2"? I watched the YouTube video you linked in another post and saw the phone boot up, but then I appears that it is showing an error message.(possibly a force close of some sort. Sorry, I can't read whatever language that was in) Then the video stopped before showing the phone in a usable state. Can you provide verification that the phone is usable after doing what you are suggesting? I ask because to me there is a difference between booting up to endless force closures and booting up to a useable phone.
Click to expand...
Click to collapse
First: Youtube video is about China 4.1.2 not working - if see youtube video name... (touchscreen not working)!!! ,2nd: Mearet ICS booted fine - if you also seen screenshots under my post. It's says on AT&T kernel builded in 08.31, but Mearet kernel build date is in August 20... JB is in JANUARY...

turffe said:
First: Youtube video is about China 4.1.2 not working - if see youtube video name... (touchscreen not working)!!! ,2nd: Mearet ICS booted fine - if you also seen screenshots under my post. It's says on AT&T kernel builded in 08.31, but Mearet kernel build date is in August 20... JB is in JANUARY...
Click to expand...
Click to collapse
I see. I must've misunderstood. Thanks for the clarification. So what are the implications of this exactly? Does this mean AT&T owners are not limited to AT&T firmware so long as they back up their CID?
Brought to you by time and relative dimensions in space.

1BadWolf said:
I see. I must've misunderstood. Thanks for the clarification. So what are the implications of this exactly? Does this mean AT&T owners are not limited to AT&T firmware so long as they back up their CID?
Brought to you by time and relative dimensions in space.
Click to expand...
Click to collapse
Yes, that means it's same like in RAZR - we can use any A2 (Indian MB865, China ME865 or any A2 kernel)... But different A2 models is different hardware (for example radio chip), so if we flashed ME865 fw via CID erasing we posible will have Wi-Fi disconnection issues & etc...
And also this means that we can convert AT&T MB865 to China ME865 and use Official MIUI on AT&T without battery issues (this is only hypothetic, tomorrow i'll test it).

Hi turffee!
Your device is AT&T Atrix 2?
The bootloader of your device is unlocked?
please put this command to terminal emulator, or adb shell with su
cat /proc/omap_dev_type
If this returns NS, can you share your mbm.img and mbmloader.img?
dd if=/dev/block/mmcblk1p1 of=/sdcard/mbmloader.img
dd if=/dev/block/mmcblk1p2 of=/sdcard/mbm.img
Thanks

My device is AT&T. It HS device. There's one thread with unlocked A2 it returns command to NS. That person also shared mbmloader.bin & mbm.bin for public (only for devs) - also if you'll find that files (thread) DON'T TRY FLASHING NS BOOTLOADER TO HS DEVICE (including all A2) or you'll hard bricked!!!
Also about CID erasing. Then you erase your CID, your device loosing region identification, so you can flash any A2 firmware. Bootloader is still locked, like & many others inxluding Jim's A2, it's just bypassing region...
Sent from my MB865 using Tapatalk 2

turffe said:
My device is AT&T. It HS device. There's one thread with unlocked A2 it returns command to NS. That person also shared mbmloader.bin & mbm.bin for public (only for devs) - also if you'll find that files (thread) DON'T TRY FLASHING NS BOOTLOADER TO HS DEVICE (including all A2) or you'll hard bricked!!!
Also about CID erasing. Then you erase your CID, your device loosing region identification, so you can flash any A2 firmware. Bootloader is still locked, like & many others inxluding Jim's A2, it's just bypassing region...
Sent from my MB865 using Tapatalk 2
Click to expand...
Click to collapse
Actually no, my dev phone is a NS device, and has the correct Efuses flipped, it is NOT just a region bypass, it also has writting all over it stating that it is not for resale.

turffe said:
You can flash that on AT&T.
!WARNING! This metod is only for advanced users... If don't know what is CID. Don't flash that files!!!
OLD MY POST (to prove that metod is working on AT&T A2): http://forum.xda-developers.com/showthread.php?p=42246899#post42246899
But I don't recomended that... And also DON'T TRY TO FLASH RETAIL A2 FW VIA RSD EVEN WITH ERASED CID!!!
Click to expand...
Click to collapse
thank for your advanced feedback , :good:
i'm on miuiv5 3.5.31 (china version)
now i want to flash leak3 JB china 4.1.2 to get access for miui v5 updating rom
which method that i'm gonna do?
honestly i'm super-noob motorola user here,
please help me

[Q] Atrix 2 from ebay Cyanogen Mod installed, how to flash back to stock?

Hello,
I bought an Atrix 2 at ebay (the seller said it is new), unfortunately there is Cyanogen Mod with Android 4.1.2 installed. If there is any safe way to flash back to stock I would prefer this, instead of sending it back because I live in Europe and bought it in USA .
Could you recommend me an easy secure way to flash back to a stock rom? Unfortunately I don't know where to start.
Thanks,
c.

calualeaf said:
Hello,
I bought an Atrix 2 at ebay (the seller said it is new), unfortunately there is Cyanogen Mod with Android 4.1.2 installed. If there is any safe way to flash back to stock I would prefer this, instead of sending it back because I live in Europe and bought it in USA .
Could you recommend me an easy secure way to flash back to a stock rom? Unfortunately I don't know where to start.
Thanks,
c.
Click to expand...
Click to collapse
To be honest, the best thing you can do right now is read. All of this has been covered before, repeatedly, and all the information is readily available as well as easily accessible. What you don't want to do is start flashing things without knowing what you're doing and how to get yourself out of trouble should you encounter any issues. So take your time and browse around the forums and familiarise yourself with the various flashing procedures. You won't regret it.:thumbup:
Brought to you by time and relative dimensions in space.

1BadWolf said:
To be honest, the best thing you can do right now is read.
Click to expand...
Click to collapse
Ok, ok, you are right so I found these two threads, so I think I know now how to flash and where to find fxz. But I don't know which fxz Version is the right one, my Phone don't have a at&t logo on the cover. I expect that it is a US Version but I'm not sure.
Noob Guide: http://forum.xda-developers.com/showthread.php?t=1396650
ATT 4.0.4 http://forum.xda-developers.com/showthread.php?t=1961310
other 4.0.4 firmwares: http://forum.xda-developers.com/showthread.php?t=1934874
I've read about that it does matter if you have installed leak #1 or #2 or the OTA stock firmware. I don't know which was installed before the custom ROM.
Could you help with these two questions?

calualeaf said:
Ok, ok, you are right so I found these two threads, so I think I know now how to flash and where to find fxz. But I don't know which fxz Version is the right one, my Phone don't have a at&t logo on the cover. I expect that it is a US Version but I'm not sure.
Noob Guide: http://forum.xda-developers.com/showthread.php?t=1396650
ATT 4.0.4 http://forum.xda-developers.com/showthread.php?t=1961310
other 4.0.4 firmwares: http://forum.xda-developers.com/showthread.php?t=1934874
I've read about that it does matter if you have installed leak #1 or #2 or the OTA stock firmware. I don't know which was installed before the custom ROM.
Could you help with these two questions?
Click to expand...
Click to collapse
Post a screenshot of your about phone screen. The build date is the give away, on the kernel. When you post that one of us can point out if you have leak one installed.
I will be very honest here, and since you are not sure which stock version was on the phone before, you have a high chance of bricking the phone. If does not have the ATT logo, it does not tell us much. You could still have an HK version of the phone which is as locked down as the ATT one is, or you could have an Asian version, which would be good, since they are not as locked down...
I would tread very lightly here, and I would tell you to just flash another non-stock ROM from the dev section, on it, as that won't brick you.. But you really need to find a way to figure out which phone you have.

jimbridgman said:
Post a screenshot of your about phone screen. The build date is the give away, on the kernel. When you post that one of us can point out if you have leak one installed.
Click to expand...
Click to collapse
Attached you will find two screenshots, thanks for checking.
I will be very honest here, and since you are not sure which stock version was on the phone before, you have a high chance of bricking the phone. If does not have the ATT logo, it does not tell us much. You could still have an HK version of the phone which is as locked down as the ATT one is, or you could have an Asian version, which would be good, since they are not as locked down...
Click to expand...
Click to collapse
What would happen if I flash the ATT firmware, assuming that it is an asian or Hongkong Version will it result in a hard brick or a soft brick?
I would tread very lightly here, and I would tell you to just flash another non-stock ROM from the dev section, on it, as that won't brick you.. But you really need to find a way to figure out which phone you have.
Click to expand...
Click to collapse
As far as I can see, there is no custom ROM which has a working webtop, I would like to use webtop. Or do you know any ROMs with webtop? I searched a lot about finding out if it is possible to figure out which hardware is in the device to check which firmware version could be right but I found nothing .

You have AT&T 125 fxz kernel... It builded in 08.31. But you also need to check your imei... And does your phone have any AT&T logo? On box or on digitizer?? It also can be AT&T phone but with Retail Atrix digitizer.... or worse Retail A2 locked down from higher cdt.bin from AT&T fw.

calualeaf said:
As far as I can see, there is no custom ROM which has a working webtop, I would like to use webtop. Or do you know any ROMs with webtop? I searched a lot about finding out if it is possible to figure out which hardware is in the device to check which firmware version could be right but I found nothing .
Click to expand...
Click to collapse
As far as I know, NUMA, ICSupercharged V7, Swifty Trix, and Stocky Ed all have working webtop.
Brought to you by time and relative dimensions in space.

turffe said:
You have AT&T 125 fxz kernel... It builded in 08.31. But you also need to check your imei... And does your phone have any AT&T logo? On box or on digitizer?? It also can be AT&T phone but with Retail Atrix digitizer.... or worse Retail A2 locked down from higher cdt.bin from AT&T fw.
Click to expand...
Click to collapse
Thanks for the telling me the Kernel Version. Could you please explain, what do you mean by "check your IMEI"? I think you don't want me to post IMEI?
The Phone does not have any ATT Logo, not on the digitizer neither on the box. I saw that the Text on the box is only written in french.
So even with knowing that it's the ATT Kernel, it's not sure if I can flash the ATT firmware:
http://forum.xda-developers.com/showthread.php?t=1961310

calualeaf said:
Thanks for the telling me the Kernel Version. Could you please explain, what do you mean by "check your IMEI"? I think you don't want me to post IMEI?
The Phone does not have any ATT Logo, not on the digitizer neither on the box. I saw that the Text on the box is only written in french.
So even with knowing that it's the ATT Kernel, it's not sure if I can flash the ATT firmware:
http://forum.xda-developers.com/showthread.php?t=1961310
Click to expand...
Click to collapse
And also is the IMEI matches with one printed on box? Is the box orange color with AT&T logo or Motorola retail red like this - http://www.use.com/media/2013/0118/3075001/p_001.jpg?1 or http://asset2.cbsistatic.com/cnwk.1d...42_620x433.jpg
---------- Post added at 10:41 PM ---------- Previous post was at 10:20 PM ----------
Enter SN from IMEI sticker to this site: http://sndeep.info/en .It's completely safe, because it also confirmed by
4pda.ru, post:
Спойлер (+/-) ( НОМЕР МОДЕЛИ с sndeep.info)
MB865
AP3025AH4H8 - Черный
AP3025AD1H8 - Белый
ME865
AP3378AE7U2
AP127203051A - (возможно для белого)
ATT
00057NAATT
00058NAATSD
And post that model showed it...

turffe said:
And also is the IMEI matches with one printed on box? Is the box orange color with AT&T logo or Motorola retail red like this - ...
Click to expand...
Click to collapse
hm I think the box was a good hint, the IMEI on the box is the same as in phone. Attached you will find photos of the box, on the back of the box is a motorola.com.tw URL, am I right if I say ist is the Hongkong/Taiwan Version?

calualeaf said:
hm I think the box was a good hint, the IMEI on the box is the same as in phone. Attached you will find photos of the box, on the back of the box is a motorola.com.tw URL, am I right if I say ist is the Hongkong/Taiwan Version?
Click to expand...
Click to collapse
And also if the box imei matches with on phone screen imei (code: *#06#)?

turffe said:
And also if the box imei matches with on phone screen imei (code: *#06#)?
Click to expand...
Click to collapse
Yes, it is still the same .

calualeaf said:
Yes, it is still the same .
Click to expand...
Click to collapse
That's bad because it's hk phone with at&t fw.... You'll be unable to downgrade to hk fw version... Is your phone under warranty??

turffe said:
[/COLOR]Enter SN from IMEI sticker to this site: http*://sndeep.info/en .It's completely safe, because it also confirmed by
4pda.ru, post:
Спойлер (+/-) ( НОМЕР МОДЕЛИ с sndeep.info)
MB865
AP3025AH4H8 - Черный
AP3025AD1H8 - Белый
ME865
AP3378AE7U2
AP127203051A - (возможно для белого)
ATT
00057NAATT
00058NAATSD
And post that model showed it...
Click to expand...
Click to collapse
Oh I didn't saw that, the result of the check is strange:
Motorola MB860 Atrix 4G
Year: 2012
Month: March
Age: 1 year and 4 months
Model Number: AP3089AW2X3
The IMEI on the Box is not the same as the result of the check and Iam very sure that this is not an MB860.
BTW on the IMEI sticker is also a Model Number maybe this helps:
AP129501187B

calualeaf said:
Oh I didn't saw that, the result of the check is strange:
Motorola MB860 Atrix 4G
Year: 2012
Month: March
Age: 1 year and 4 months
Model Number: AP3089AW2X3
The IMEI on the Box is not the same as the result of the check and Iam very sure that this is not an MB860.
BTW on the IMEI sticker is also a Model Number maybe this helps:
AP129501187B
Click to expand...
Click to collapse
Try to flash this Retail Asian fw via RSD Lite - 6.7.2_EDEM-18-SEARET_cfc.xml.zip LINK: http://sbfdownload.droid-developers.org/edison/6.7.2_EDEM-18-SEARET_cfc.xml.zip
Does it failing on cdt.bin?? If yes does your phone is under warranty?

turffe said:
Try to flash this Retail Asian fw via RSD Lite - 6.7.2_EDEM-18-SEARET_cfc.xml.zip LINK: http://sbfdownload.droid-developers.org/edison/6.7.2_EDEM-18-SEARET_cfc.xml.zip
Does it failing on cdt.bin?? If yes does your phone is under warranty?
Click to expand...
Click to collapse
hm yes it fails on cdt.bin and shows now "flash failure", is it brick? I have warranty but I think I should restore the Custom ROM.

calualeaf said:
hm yes it fails on cdt.bin and shows now "flash failure", is it brick? I have warranty but I think I should restore the Custom ROM.
Click to expand...
Click to collapse
Reflash HK (with boot failure screen) fw & bring it to warranty & fool it (that it shuted off while charging & shows fastboot err. They'll try couple times flash Retail fw, but it will fail at cdt.bin & most likely they'll replace your board).
.

turffe said:
Reflash HK (with boot failure screen) fw & bring it to warranty & fool it (that it shuted off while charging & shows fastboot err. They'll try couple times flash Retail fw, but it will fail at cdt.bin & most likely they'll replace your board).
.
Click to expand...
Click to collapse
I think I send it back to the ebay seller to get my money back I tried to reflash several ROMs with recovery, but I get always "Signature Verification failed"

calualeaf said:
I think I send it back to the ebay seller to get my money back I tried to reflash several ROMs with recovery, but I get always "Signature Verification failed"
Click to expand...
Click to collapse
You have to disable signature verification in CWM.

[Request] xt1540 stock 5.1.1 recovery image

I have a slow internet connection and I only need stock recovery image. Can anyone upload it for me, please?

NeriL said:
I have a slow internet connection and I only need stock recovery image. Can anyone upload it for me, please?
Click to expand...
Click to collapse
Can you tell me which one of these you want (e.g. US, Canada) and I can see if I can extract it for you? http://forum.xda-developers.com/2015-moto-g/general/index-moto-g-factory-firmware-images-t3169639

build.prop says:
ro.product.name=osprey_retla_na
(Retail Latin America)
...but there is no matching firmware for xt1540 5.1.1
I guess Tigo Latin America should work.. I guess carriers only modify "system" image
Thank you very much for your help! =)

NeriL said:
build.prop says:
ro.product.name=osprey_retla_na
(Retail Latin America)
...but there is no matching firmware for xt1540 5.1.1
I guess Tigo Latin America should work.. I guess carriers only modify "system" image
Thank you very much for your help! =)
Click to expand...
Click to collapse
Here we go: https://drive.google.com/file/d/0B6rld7atb8yHamtISVVKaUQtT1k/view?usp=sharing

Thank you very much!
I'll try it and, if it works, I'll post it here in case the info helps someone else

Ok, I flashed it and everything seemed to be ok.. But when trying to install official 6.0 update it progresses to around 35% and then reboots.. No changes are made when booted..
I'm not sure if update is corrupt, recovery is incompatible, it has issues with root or unlocked bootloader.. Any idea?

NeriL said:
Ok, I flashed it and everything seemed to be ok.. But when trying to install official 6.0 update it progresses to around 35% and then reboots.. No changes are made when booted..
I'm not sure if update is corrupt, recovery is incompatible, it has issues with root or unlocked bootloader.. Any idea?
Click to expand...
Click to collapse
Read this http://forum.xda-developers.com/showpost.php?p=65308240&postcount=34

Oh! Thanks for the link! I didn't know that.. =)
I think this thread can be closed now

Flashing stock rom with odin / sw rev. fail

Hi, I recently tried to get my phone unlocked. I watched the guy do it, he flashed an older modem and then flashed a UAE firmware.
My original is O2 UK, and I'd like to revert to this firmware as the About Device section shows up with Unted Arab Emirates and the mobile networks section shows LTE rather than 4G.
I have tried flashing the latest revision of the O2 stock rom and odin fails attempting to write sboot.bin with the error message SW Rev. fail (I don't recall the exact numbers after this) appearing on the phone.
I am guessing this is the secure boot loader, which I am aware you can't downgrade, but is there any way of flashing this stock rom since I know it is compatible with the phone?

Try to flash G920FXXU5DQA7 (CSC code:BTU)

chemeleon said:
Hi, I recently tried to get my phone unlocked. I watched the guy do it, he flashed an older modem and then flashed a UAE firmware.
My original is O2 UK, and I'd like to revert to this firmware as the About Device section shows up with Unted Arab Emirates and the mobile networks section shows LTE rather than 4G.
I have tried flashing the latest revision of the O2 stock rom and odin fails attempting to write sboot.bin with the error message SW Rev. fail (I don't recall the exact numbers after this) appearing on the phone.
I am guessing this is the secure boot loader, which I am aware you can't downgrade, but is there any way of flashing this stock rom since I know it is compatible with the phone?
Click to expand...
Click to collapse
You could possibly use smartswitch if you have the serial number of the phone which would download the default firmware that the phone came with if odin fails again

Yes i agree, smartswitch could be your best option.

Thanks for the suggestions. Tried Smart Switch, same error. It appears on the phone as sw rev. check fail.
What exactly is the problem here? Is it that the installed firmware has a newer bootloader than the most recent O2 firmware? In which case is there any way around it?

chemeleon said:
Thanks for the suggestions. Tried Smart Switch, same error. It appears on the phone as sw rev. check fail.
What exactly is the problem here? Is it that the installed firmware has a newer bootloader than the most recent O2 firmware? In which case is there any way around it?
Click to expand...
Click to collapse
Yeah looks like this is a bootloader issue, it won't let you install a firmware which contains an older bootloader, only thing I can is to download the latest non branded UK firmware and see if that flashes.

I'm getting this error too with Device 4 Binary 3 but i didn't find the right firmware yet
I hope in Nougat release

chemeleon said:
Thanks for the suggestions. Tried Smart Switch, same error. It appears on the phone as sw rev. check fail.
What exactly is the problem here? Is it that the installed firmware has a newer bootloader than the most recent O2 firmware? In which case is there any way around it?
Click to expand...
Click to collapse
LollosoSi said:
I'm getting this error too with Device 4 Binary 3 but i didn't find the right firmware yet
I hope in Nougat release
Click to expand...
Click to collapse
As I said before;
Try to flash G920FXXU5DQA7 (CSC code:BTU)

forumber2 said:
As I said before;
Try to flash G920FXXU5DQA7 (CSC code:BTU)
Click to expand...
Click to collapse
Sammobile is under maintenance right now and there are no mirrors reasonably fast... 8 hours for a download.
Anyway update is coming these weeks, I'll wait

LollosoSi said:
Sammobile is under maintenance right now and there are no mirrors reasonably fast... 8 hours for a download.
Anyway update is coming these weeks, I'll wait
Click to expand...
Click to collapse
You could try using samfirm which a windows application which downloads samsung firmwares

LollosoSi said:
Sammobile is under maintenance right now and there are no mirrors reasonably fast... 8 hours for a download.
Anyway update is coming these weeks, I'll wait
Click to expand...
Click to collapse
As @sofir786 said, you can use SamFirm;
https://forum.xda-developers.com/attachment.php?attachmentid=3803841&d=1467715462
When you open it, set the settings like this;

sofir786 said:
You could try using samfirm which a windows application which downloads samsung firmwares
Click to expand...
Click to collapse
Wow I didn't know, it works thanks
forumber2 said:
As I said before; Try to flash G920FXXU5DQA7 (CSC code:BTU)
Click to expand...
Click to collapse
I'll try flashing when the download finishes
Edit:
WORKING!
I used last(I think) ITV
File names:
AP: AP_G920FXXU5DQA7_CL8821257_QB12271362_REV02_user_low_ship.tar
CSC: CSC_ITV_G920FITV5DQA2_CL10387678_QB12242913_REV02_user_low_ship.tar
BL: BL_G920FXXU5DQA7_CL8821257_QB12271362_REV02_user_low_ship.tar
CP: CP_G920FXXU5DPL3_CL8821257_QB11771442_REV02_user_low_ship.tar

Samsung updated their bootloaders to 4XX in September/October so you cant flash back an older one or downgrade,so the only solution you have is to flash the new one which is 5XX released this year.

Flashed the latest UK revision (not the O2 branded one) and it worked

chemeleon said:
Flashed the latest UK revision (not the O2 branded one) and it worked
Click to expand...
Click to collapse
Told you

Is there a reliable and working guide to downgrade the U12+ to Oreo

Hello all,
after almost 2 months handling with the worst Android version all time, i would to like to downgrade to Oreo which was working better for my requirements and expectations, but i don't find any reliable guide to get on it.
I was trying to do my job using this guide https://forum.xda-developers.com/showpost.php?p=80192495&postcount=14 which is intended to rollback htc u11+ devices to a former Android version and using this file: 2Q55IMG_IMAGINE_DUGL_O80_SENSE10GP_HTC_Europe_1.21.401.3_Radio_sdm845-000191c-1806221012_release_526865_signed_2_4.zip, but, I'm stuck here at step 14:
C:\Android\com>htc_fastboot flash hosd hosd_signed.img
htc_fastboot v3.0.9.2 (2015-05-29)
target reported max download size of 1070400000 bytes
sending 'hosd' (24396 KB)...
OKAY [ 1.978s]
writing 'hosd'...
(bootloader) HOSD CL#1088647
FAILED (remote: 35 RU_PARTITION_NOT_SUPPORT hosd)
finished. total time: 3.995s
htc_fastboot finished. total time: 4.111s
Click to expand...
Click to collapse
After reading a good troubleshooting found it here https://forum.xda-developers.com/showpost.php?p=76606118&postcount=4 i did realized that i was executing by mistake the flash command in download mode. After trying the flash command in bootloader mode the phone doesn't respond.
C:\Android\com>htc_fastboot flash hosd hosd_signed.img
htc_fastboot v3.0.9.2 (2015-05-29)
C:\Android\com>
Click to expand...
Click to collapse
Could somebody tell me where can i find a guide to finish my work or may be a little help with it?
Thx in advance

I think you was referring to Oreo right?
Find and download latest version of Oreo you need for your specific version of u12+
rename the zip in 2Q55IMG.zip
put the zip in sdcard
Reboot to download mode and let It flash
Done!

DOWNLOAD RUU here --> https://docs.google.com/spreadsheets/d/1wIRrVQawd5rD-t9VKPQ-SdRK20RcJVZhwD7lhmPIK8w/edit#gid=0

SIRKRA said:
I think you was referring to Oreo right?
Click to expand...
Click to collapse
Yes you're right, i mean Oreo ,
where can i find the latest Oreo version for my U12+ CID htc_034, i have found this one here, which maybe is one of the first versions implemented in U12+:
2Q55IMG_IMAGINE_DUGL_O80_SENSE10GP_HTC_Europe_1.21.401.3_Radio_sdm845-000191c-1806221012_release_526865_signed_2_4.zip
I really didn't know that it is so easy, i'll try and i'll give feed back later, thanks SIRKRA :good:
fabrizio b92 said:
DOWNLOAD RUU here --> https://docs.google.com/spreadsheets/d/1wIRrVQawd5rD-t9VKPQ-SdRK20RcJVZhwD7lhmPIK8w/edit#gid=0
Click to expand...
Click to collapse
Thanks Fabrizio, i'm downloading :good:

Be sure to download and flash the right version, there are dual SIM and single SIM roms

SIRKRA said:
Be sure to download and flash the right version, there are dual SIM and single SIM roms
Click to expand...
Click to collapse
I've Dual SIM, i take care about that detail, thanks for the recommendation SIRKRA

I didn't have much luck at all, i become the error message:
10 RU_MODELID_FAIL: MID modelid in android-info mismatched.

qtek_metanol said:
I didn't have much luck at all, i become the error message:
10 RU_MODELID_FAIL: MID modelid in android-info mismatched.
Click to expand...
Click to collapse
Use this accorded with Infos on your model
https://androidfilehost.com/?fid=11410932744536984886

SIRKRA said:
Use this accorded with Infos on your model
https://androidfilehost.com/?fid=11410932744536984886
Click to expand...
Click to collapse
Thanks for the Info SIRKRA, well i've tried 4 times with differents RUU's:
2Q55IMG_IMAGINE_DUGL_O80_SENSE10GP_HTC_Europe_1.30.401.2_Radio_sdm845-000201b-1807311356_release_528103_signed_2_4
2Q55IMG_IMAGINE_DUGL_O80_SENSE10GP_HTC_Europe_1.21.401.3_Radio_sdm845-000191c-1806221012_release_526865_signed_2_4
2Q55IMG_IMAGINE_DUGL_O80_SENSE10GP_HTC_Europe_1.25.401.3_Radio_sdm845-000191c-1806221012_release
2Q55IMG_IMAGINE_DUGL_O80_SENSE10GP_HTC_Europe_1.15.401.4_Radio_sdm845-000022-1804031643_release_524465_signed_2_7
And i become the same error back, see picture.
My htc u12+ ist CID__034
But now that i'm reading the whole CID Info, i found this:
[rild.libpath]: [/vendor/lib64/libhtc_rilhook.so]
[ro.aa.cidlist]: [HTC__001,HTC__M27,HTC__034]
[ro.aa.customizationid]: [3072105]
[ro.aa.maincid]: [HTC__001]
[ro.aa.mainsku]: [401]
[ro.aa.modelid]: [2Q5520000]
[ro.aa.project]: [IMAGINE_UHL_P90_SENSE10GP_MR] --> SINGLE SIM???
I think that I'm feeling betrayed by o2. I#m gonnat contact then.
Is that really a single SIM?

yes you have a single sim, same as me and i am happier with the single sim.
i rather have expandable storage than two sim cards, i never use a second sim anyway
so
download this one
https://androidfilehost.com/?fid=11410932744536986129
rename it to
2Q55IMG.zip
you put the file to your SD-card, much easier and faster than pushing it to the phone, like the dual sim guys have to do
be sure that you put the file in the root of the external memory, NOT in a folder
Now you turn your mobile off
Connect your cable to the phone, push the volume down key and than connect the cable to the pc
Now you are in bootloader mode, from there you use the volume keys to navigate to download mode
press power and you are allmost done
in download mode you will be asked to press volume up or down, to confirm the flash or to cancel
congratulations, you are back on oreo
good yob

It's all correct about it's a single SIM, but not the part about dual SIM, as i have One, that you Need to push etc, you can choose between using an sd card or a SIM in the second slot.

qtek_metanol said:
I think that I'm feeling betrayed by o2. I#m gonnat contact then.
Is that really a single SIM?
Click to expand...
Click to collapse
If you bought your U12+ directely from o2 Germany, you have a single SIM device. As far as I know, they never sold any dual SIM model of HTC phones.
In the o2 community, the o2 mods also stated that the U12+ sold by them was the single SIM model: https://hilfe.o2online.de/weitere-hersteller-28/htc-u12-dual-sim-229776 (sorry, only in German)

So finally i got the the misunderstanding with the phone provider clarify and i get a remuneration for it. Late at night i installed successfully the recommended RUU:
2Q55IMG_IMAGINE_UHL_O80_SENSE10GP_HTC_Europe_1.30.401.2_Radio_sdm845-000201b-1807311356_release_528110_signed_2_4.zip
thanks to karlanal for the recommendation, it was no many RUU options for SIM devices to download.
SIRKRA said:
It's all correct about it's a single SIM, but not the part about dual SIM, as i have One, that you Need to push etc, you can choose between using an sd card or a SIM in the second slot.
Click to expand...
Click to collapse
The way how htc solves the use of DUAL SIM card on htc u12+ was very poor and cheaper. The customer must decide between the usage from DUAL or a external card, which is neccesary, due to the short capacity in the own internal memory, that solution was not fair from HTC.
schinge said:
If you bought your U12+ directely from o2 Germany, you have a single SIM device. As far as I know, they never sold any dual SIM model of HTC phones.
In the o2 community, the o2 mods also stated that the U12+ sold by them was the single SIM model: https://hilfe.o2online.de/weitere-hersteller-28/htc-u12-dual-sim-229776 (sorry, only in German)
Click to expand...
Click to collapse
Yes i bought it directly from a O2 shop in the near, a newbie handle my case.
The reasons why i've donwgrade my phone:
* By Starting the phone, the host for SD card started delayed and the camera app changed the settings to save the pictures to the internal memory (with Oreo is that bug gone)
* Usefully widgets like the energie-dashboard worked defective (with Oreo is runable)
* Older HTC Apps were not runable
* Bad implementation of the connectivity with MirrorLink (no audio reproduction), i assume Google prefers to place their produt (Android Auto) at the first place and therefore maked the app unusable. (with Oreo is runable again)
I will like to thank everyone who gave me input to solve my issue.:good:

Error message 19 RU_MAIN_VER_FAIL os-version in android-info missing or i(nvalid)
Hi all,
does somebody know how to remedy this error?
19 RU_MAIN_VER_FAIL os-version in android-info missing or i(nvalid)
I have my device bootlooped after rooting, flashing LeeDroiD Pie and uninstalling some system app. I tried to flash 1.30 via SD card to get my HTC 12+ to work again. The RUU is from the Google spreadsheet.
In bootloader, it says OS 2.55.401.1, with getvar I got version-main 1.53.401.5.
Any help is appreciated.
Thanks,
Bee.

I like this post. Thank for the good tips.