Downgrade to Stock Rom - Lenovo P2 Guides, News, & Discussion

Hello,
I am currently using Lineage OS 15.1 but as I have massive lags, I would like to go back to stock rom.
First question:
1) How can I get the offiical rom?
2) What is the proper process of downgrading?
Thanks,

Just flash this like any other ROM in TWRP. It's the stock 251
https://drive.google.com/file/d/1f3USp3-VncUAtIi2aBzSZ7kzLlYJ7iok/view?usp=drivesdk

Related

Install stock rom from a custom rom ?

Hello guys,
I'm now on a custom ROM but I'd like to get back to the stock CM11s ROM.
However I couldn't find how to flash it with the recovery without losing my internal storage so I'd like to know if there is a way ?
(All I found was the factory image which needs to flash with fastboot so I'll loose all my date.)
Thank you.
There is a stock rooted version of 44S by Calkulin in the development section that you can flash like any other ROM.
Transmitted via Bacon

Unable to get OTA Updates installed on TWRP - Need to go back to stock recovery

Hi All,
Background:
Installed TWRP recovery to downgrade to KitKat from Android ver 5.0.2 / COS 12.0 YNg1TAS17L
( I guess the changes in lollipop made me to do so).
But after installing TWRP, for some reason or other I did nothing and now the issue is the OTA are not getting installed. From other similar thread I know that we can download the OTA zip and install through TWRP and I am not looking to get into that...as I am giving this device to my family.
Help Required:
1) Is there a way to uninstall TWRP and go back to stock recovery without losing any data?
( Is it as simple as flashing recovery image from the Stock ROM?)
2) Using the OnePlus tool kit can we flash the stock ROM which will also restore the stock recovery?
(If so is it possible to flash the latest ROM 5.1.1 or CM12.1)
I just need guidance here with steps on what will be the best and safe approach without frying up my device.
Please suggest
droidfry said:
Hi All,
Background:
Installed TWRP recovery to downgrade to KitKat from Android ver 5.0.2 / COS 12.0 YNg1TAS17L
( I guess the changes in lollipop made me to do so).
But after installing TWRP, for some reason or other I did nothing and now the issue is the OTA are not getting installed. From other similar thread I know that we can download the OTA zip and install through TWRP and I am not looking to get into that...as I am giving this device to my family.
Help Required:
1) Is there a way to uninstall TWRP and go back to stock recovery without losing any data?
( Is it as simple as flashing recovery image from the Stock ROM?)
2) Using the OnePlus tool kit can we flash the stock ROM which will also restore the stock recovery?
(If so is it possible to flash the latest ROM 5.1.1 or CM12.1)
I just need guidance here with steps on what will be the best and safe approach without frying up my device.
Please suggest
Click to expand...
Click to collapse
Numerous other threads on the same subject... I don't understand why you are not ready to flash the OTA through TWRP but you are through stock recovery... It's the same thing... Don't use toolkit, they are the ones, in 99% of the cases, that "fry" your phone... As soon as TWRP is installed no OTA will automatically, you will have to flash them manually.

Samsung S4 SGH-I337 Safestrap not working rom

Hello everybody! I have a problem: I wanted to install custom ROM via Safestrap 3.71. I made all the wipe. But at the end of the installation, I get an error: set_metadata_recursive some changes failed. And so in each ROM. After that, ROM does not load: black screen after the logo Samung Custom. How to deal with this?
[R]ainbow[D]ash said:
Hello everybody! I have a problem: I wanted to install custom ROM via Safestrap 3.71. I made all the wipe. But at the end of the installation, I get an error: set_metadata_recursive some changes failed. And so in each ROM. After that, ROM does not load: black screen after the logo Samung Custom. How to deal with this?
Click to expand...
Click to collapse
Was it a true custom ROM? Or was it a modified stock ROM?
If it was a custom ROM such as Cyanogenmod or LineageOS, that's the problem.
Safestrap is intended to be used with modified stock ROMs that are based on stock kernel, not CM, AOSP or Lineage based ROMs.
Typically, Safestrap is used on devices with locked bootloader, these devices can't use CM, AOSP or Lineage based ROMs, these ROMs are built to be flashed via custom recovery such as TWRP.
If you have an unlocked bootloader and you want to use custom ROMs then you'll have to flash TWRP then use TWRP to flash the ROM.
If your device does not have an unlocked bootloader but you want to use Safestrap then you need to install TouchWiz(TW)/stock based ROMs.
There is a difference.
Also, when using Safestrap, you have to leave the stock rom in one slot and place the new ROM in a different slot. You can't overwrite the existing stock ROM with the new ROM, that causes issues and the device won't boot.
You will probably have to flash your stock firmware via Odin and start over with root and flashing.
I DO NOT PROVIDE HELP IN PM, KEEP IT IN THE THREADS WHERE EVERYONE CAN SHARE
Droidriven said:
Was it a true custom ROM? Or was it a modified stock ROM?
If it was a custom ROM such as Cyanogenmod or LineageOS, that's the problem.
Safestrap is intended to be used with modified stock ROMs that are based on stock kernel, not CM, AOSP or Lineage based ROMs.
Typically, Safestrap is used on devices with locked bootloader, these devices can't use CM, AOSP or Lineage based ROMs, these ROMs are built to be flashed via custom recovery such as TWRP.
If you have an unlocked bootloader and you want to use custom ROMs then you'll have to flash TWRP then use TWRP to flash the ROM.
If your device does not have an unlocked bootloader but you want to use Safestrap then you need to install TouchWiz(TW)/stock based ROMs.
There is a difference.
Also, when using Safestrap, you have to leave the stock rom in one slot and place the new ROM in a different slot. You can't overwrite the existing stock ROM with the new ROM, that causes issues and the device won't boot.
You will probably have to flash your stock firmware via Odin and start over with root and flashing.
I DO NOT PROVIDE HELP IN PM, KEEP IT IN THE THREADS WHERE EVERYONE CAN SHARE
Click to expand...
Click to collapse
I was flashing the modified ROM on the stock kernel. I put in the recovery on slot-rom1. I tried to flash: CarHD, KushanROM, GOLDENEYE and Omega. And still it does not work out
[R]ainbow[D]ash said:
I was flashing the modified ROM on the stock kernel. I put in the recovery on slot-rom1. I tried to flash: CarHD, KushanROM, GOLDENEYE and Omega. And still it does not work out
Click to expand...
Click to collapse
Do you still have your original stock ROM in one of the slots? Or did you overwrite it? If you overwrite it, you messed up. As stated earlier, you'll probably have to flash the original stock firmware via Odin.
I DO NOT PROVIDE HELP IN PM, KEEP IT IN THE THREADS WHERE EVERYONE CAN SHARE
Droidriven said:
Do you still have your original stock ROM in one of the slots? Or did you overwrite it? If you overwrite it, you messed up. As stated earlier, you'll probably have to flash the original stock firmware via Odin.
I DO NOT PROVIDE HELP IN PM, KEEP IT IN THE THREADS WHERE EVERYONE CAN SHARE
Click to expand...
Click to collapse
The stock slot remained intact. But if I take the kernel from OC3, then the device will also not boot up and the recovery will become non-working.
Send me the stock ROM for flashed the custom ROM through the Safestrap. And send me the version of the Safestrap for custom ROM
I understood what the problem is. I installed another ROM NB1 and it all worked for me.

Questions about kernel, custom rom and flashing/Ota updating.

I have an OnePlus5 with latest Oxygen Os android 7.1.1, rooted with magisk and with TWRP recovery. I flashed yesterday a custom kernel (blu spark), cause i wanted better battery stats. But i dont see any changes. Nor more advanced options, neither visual changes. What does exactly a kernel change to the phone? How does it differ from a custom rom? Do i need extra programs or programming in order to make full use of the kernel?
Now that i have the custom kernel, what actions should i take if :
1) I want install a custom rom
2) I want install stock rom
3) I want install another or stock kernel
When should i take full backup and why? (Nandroid via TWRP or backup with TITANIUM BACKUP??) What about OTA updates? How can i update to newest rom in each case? Each time a new rom update occurs should i take full backup, flash the rom and install them all from the start??
Someone help me please?
Sent from my ONEPLUS A5000 using Tapatalk

Stock ROM S8 plus exynos

1.Hi I'm wanna know that does it possible to install stock ROM by using twrp. Because I never see stock ROM that unique for twrp. 2. Twrp does it use only for customer ROM.
3. Anyone has stock ROM lower version than 9 ? I want to downgrade stock ROM . Seem like I used to with stock ROM than custom ROM. But I can't find any stock ROM that can install via twrp. If install on Odin. I got fail . Guessing bootloader not allow to downgrade

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