[GUIDE] Update stock rooted/modified rom to last 6.0 Marshmallow w/o losing your data

c3k · Mar 10, 2015

Requirements:

you need to have a pc with adb working
a stock firmware on your device (any)
unlocked bootloader
a working backup just in case

Pro:

you will not lose your data / application

Cons:

you will lose all system modification (root, busybox, custom kernel...)
you'll take all the risk of operation (I've tested on my device)

Guide:
some file names changes depending on version so please complete the {version_here} placeholder with the file you download
* prepend "sudo" on command line if you are on a Linux machine

download last version for your device here (if you want to root download the zip file in the section below to speed up the operations)
extract
extract image-{device_here}-{version_here}.zip in the same folder (no subdir)
command line* (or reboot device with vol down pressed):
Code:
```
adb reboot bootloader
```
command line*:
Code:
```
cd {your_path_here}
```

command line*:

Code:

fastboot flash bootloader bootloader-{device_here}-{version_here}.img

command line*:
Code:
```
fastboot reboot-bootloader
```

command line*:

Code:

fastboot flash radio radio-{device_here}-{version_here}.img

command line*:
Code:
```
fastboot flash system system.img
```
command line*:
Code:
```
fastboot flash boot boot.img
```
ONLY IF YOU FOUND A VENDOR.IMG IN THE ZIP command line*:
Code:
```
fastboot flash vendor vendor.img
```
command line*:
Code:
```
fastboot flash cache cache.img
```
command line*:
Code:
```
fastboot reboot
```

Now you have the lastest stock image and all your data.

Change recovery (TWRP) and root:
Note that we haven't flash the stock recovery, but during every boot of an unmodified system there's a script that do that (supersu usually deactive this behavior during install).
If you had TWRP installed and the SuperSU zip on your device, at the end of the above procedure you can boot directly from bootloader to recovery and go directly to last step:

download: TWRP image (twrp-{version_here}-{device_here}.img) for your device
download: chainfire SuperSU 2.71 on your device

command line*:

Code:

fastboot flash recovery twrp-{version_here}-{device_here}.img

alternatively you can keep the original recovery and use TWRP one time with

Code:

fastboot boot twrp-{version_here}-{device_here}.img

boot in recovery and flash supersu zip

turydios · Mar 10, 2015

working fine for me, all correct, thanks

cimbrum · Mar 10, 2015

Just tried with flash_all.bat. I'm getting the message "Can not generate image". How can I solve this, please?

Harmveenstra · Mar 10, 2015

Thank you, works like a charm!

chikess · Mar 10, 2015

Same here, cant flash system

c3k · Mar 10, 2015

There's not flash-all.bat in my steps (that delete you data!), can't give help about it sorry

chikess · Mar 10, 2015

i've gone your way, but i tried also the flash-all.bat with the -w switch, didnt work.

mertkan · Mar 10, 2015

Tnx mate. Helped a lot

Sp0KI · Mar 10, 2015

Cant flash the system.img manually. All the other img are working. I get this error message :

Code:

target reported max download size of 1073741824 bytes
error: cannot load 'system.img'

The old system.img from lrx22c works also.
Someone know whats going on?

chikess · Mar 10, 2015

Sp0KI said:
Cant flash the system.img manually. All the other img are working. I get this error message :

Code:

target reported max download size of 1073741824 bytes error: cannot load 'system.img'

The old system.img from lrx22c works also.
Someone know whats going on?

I think that all who has flashed the developer preview got an broken filesystem or the partitions missmatch.

Before i used the preview the -w update flag worked well to rebuild the partitions, now it didnt work anymore, tried all factory images don to 4.4

ironia. · Mar 10, 2015

c3k said:
Requirements:

you need to have a pc with adb working

a stock firmware on your device (any)

a working backup just in case

so if i have twrp, before i have to return stock 5.0.1??

or i flash directly 5.1 over twrp?

tnx

Sp0KI · Mar 10, 2015

chikess said:
I think that all who has flashed the developer preview got an broken filesystem or the partitions missmatch.

Before i used the preview the -w update flag worked well to rebuild the partitions, now it didnt work anymore, tried all factory images don to 4.4

I didn't flash the preview.

chikess · Mar 10, 2015

Sp0KI said:
I didn't flash the preview.

Hmm ok, but u got the same problems. So, in this way we had to wait for a flashable zip or maybe ota.

kurniawan77 · Mar 10, 2015

@c3k why do you mention to flash twrp while in steps above stock recovery is not included to flash... ? Doesn't that mean that custom recovery (twrp) is still on device?

foosion · Mar 10, 2015

Doesn't this require an unlocked bootloader, and not necessarily root, or am I confused?

efrant · Mar 10, 2015

Sp0KI said:
Cant flash the system.img manually. All the other img are working. I get this error message :

Code:

target reported max download size of 1073741824 bytes error: cannot load 'system.img'

The old system.img from lrx22c works also.
Someone know whats going on?

Are you using the latest version for the fastboot.exe file?

k1chy · Mar 10, 2015

foosion said:
Doesn't this require an unlocked bootloader, and not necessarily root, or am I confused?

This requires an unlocked bootloader. But, there are users like us who have rooted the stock ROM.
This guide is meant for the users who has unlocked bootloader with rooted stock ROM.

This guide will also work for phones with unlocked bootloaders with STOCK ROM(rooted or un-rooted).

efrant said:
Are you using the latest version for the fastboot.exe file?

I had faced the same issue while flashing LRX22C. It got fixed by rebooting the phone and switching the cable to a different USB port. Might work for him too.
PS: I have flashed the images from Linux.

cimbrum · Mar 10, 2015

In my case I guess all the issues are from a previous attempt to flash OptiPop ROM. The flashing process it's a little tricky to understand (with that F2FS file system). I remember that after flashed OptiPop and the phone didn't boot, I tried to restore to stock ROM and it was a lot of errors until it worked fine again.

Sp0KI · Mar 10, 2015

efrant said:
Are you using the latest version for the fastboot.exe file?

I'm using the newest Minimal ADB.
The strange thing is, that i can flash the LRX22C system.img and all other new lmy47d files but not the lmy47d system.img.
I guess i'll wait for the OTA update and hope it works then.
Tried rebooting and switching port and usb cabel..

SCFirefighter · Mar 10, 2015

You actually don't need to manually install supersu or root. Flash the 5.1 images and then (after the first full boot) flash twrp.

Once you boot into twrp and exit out of it, you will be promoted with a message that your phone is not rooted, and you're asked if you want to install supersu. It's built into twrp.

[GUIDE] Update stock rooted/modified rom to last 6.0 Marshmallow w/o losing your data

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