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[Q] Can't flash custom roms

Hello
I have read countless of threads on how to flash cyanogenmod 10.1 and other roms but I have only succeeded in flashing an official (stock) 4.1.1 firmware.
I have tried flashing with ODIN, heimdal, through CWM and with Rom Manager but with no success. My phone is rooted, that I could do. I first flashed the stock (newer) firmware, then I went on flashing clockworkmod touch and then I rooted the phone.
I want to try cyanogenmod 10.1 or other roms but I never succeed in flashing. It always gives me a kind of error and I can't understand why. Is it because the bootloader might be locked or something? I am not sure so could anyone please help me?
I have a samsung galaxy tab2 10.1 gt-p5100 tab
Thank you in advance!

[Q] From stock to CM and back with CWM?

Hi,
i got a GT-N8000 here and wanted to know (before i do anything) is it possible to backup the stock ROM, flash cyanogenmod and go back to stock ROM when needed in some way?
I would prefere to use CWM for flashing CM but with my phone (LG P880) it was not possbile to boot the stock ROM with a CWM bootloader. Is it also like this for the GT-N8000?
Thanks in advance.

Wrong question here?

Lollipop ROMs will not boot up

So i've been running stable slimkat 9.0 (4.4.4) on my galaxy s3 and it has been working great. I want to upgrade it to lollipop but I've had trouble flashing any lollipop rom. CM12, AICP, OctOS, PacROM all fail to boot after I flash in recovery. The boot animation starts, and I get the screen that android apps are initializing. After it runs through the apps, the screen blacks out and the phone resets and the cycle continues.
I've had no issues flashing roms beforehand. I can go back to 4.4. and 4.3 ROMs both AOSP and Touchwiz without any problems. I've flashed with both clockwork mod and TWRP and the results are the same. I do a clean factory reset and wipe prior to flashing the rom and 5.1 gapps.
I have no idea why it won't boot up for me. Would appreciate any help!

alphax_0 said:
So i've been running stable slimkat 9.0 (4.4.4) on my galaxy s3 and it has been working great. I want to upgrade it to lollipop but I've had trouble flashing any lollipop rom. CM12, AICP, OctOS, PacROM all fail to boot after I flash in recovery. The boot animation starts, and I get the screen that android apps are initializing. After it runs through the apps, the screen blacks out and the phone resets and the cycle continues.
I've had no issues flashing roms beforehand. I can go back to 4.4. and 4.3 ROMs both AOSP and Touchwiz without any problems. I've flashed with both clockwork mod and TWRP and the results are the same. I do a clean factory reset and wipe prior to flashing the rom and 5.1 gapps.
I have no idea why it won't boot up for me. Would appreciate any help!
Click to expand...
Click to collapse
same problem here bro
sgs3 i9300

i solved mine so if you are still experiencing that hmu i will show you what i did

alphax_0 said:
So i've been running stable slimkat 9.0 (4.4.4) on my galaxy s3 and it has been working great. I want to upgrade it to lollipop but I've had trouble flashing any lollipop rom. CM12, AICP, OctOS, PacROM all fail to boot after I flash in recovery. The boot animation starts, and I get the screen that android apps are initializing. After it runs through the apps, the screen blacks out and the phone resets and the cycle continues.
I've had no issues flashing roms beforehand. I can go back to 4.4. and 4.3 ROMs both AOSP and Touchwiz without any problems. I've flashed with both clockwork mod and TWRP and the results are the same. I do a clean factory reset and wipe prior to flashing the rom and 5.1 gapps.
I have no idea why it won't boot up for me. Would appreciate any help!
Click to expand...
Click to collapse
Are you on the correct firmware? MF1? There is a flashable zip in the CM12.1 thread for it.

Updating the firmware did the trick, thanks! Was running on ML1 up til now. Glad my s3 can still keep up with the times

Cannot Boot My I9100

Hey guys. I have a Samsung Galaxy I9100 and without any experience I tries to upgrade my firmware to Lollipop today. It was a disaster. Now I'm stuck in Cyanogenmod 12.1 5.1.1 no installing GApps and no booting, no flashing rom. I cannot install any applications on my phone. I suppose I did something wrong about recovery,but not sure. For this issue, do you guys have anything to suggest? Thanks.

drummertd said:
Hey guys. I have a Samsung Galaxy I9100 and without any experience I tries to upgrade my firmware to Lollipop today. It was a disaster. Now I'm stuck in Cyanogenmod 12.1 5.1.1 no installing GApps and no booting, no flashing rom. I cannot install any applications on my phone. I suppose I did something wrong about recovery,but not sure. For this issue, do you guys have anything to suggest? Thanks.
Click to expand...
Click to collapse
Download the firmware for your phone from sammobile.com and flash using the Odin app for windows using the instructions here.
From this flash custom recovery and try again to update to lollipop using Cyanogenmod files

I'm not able to install stock rom in tab 2

Hey guys, recently i installed omni 4.4.4 rom through twrp 3.0.2.0 but somehow the rom is not working properly so i decided to revert it to stock through odin but the thing is that it is not reverting back although stock rom is successful getting flashed still the previous rom is not disappearing. Drop some help guys

ran_droid said:
Hey guys, recently i installed omni 4.4.4 rom through twrp 3.0.2.0 but somehow the rom is not working properly so i decided to revert it to stock through odin but the thing is that it is not reverting back although stock rom is successful getting flashed still the previous rom is not disappearing. Drop some help guys
Click to expand...
Click to collapse
Sounds like the emmc got write protected due to end of life bug.
Android andi has a write up about it on his github page.