[Q] Root and Flash ROMs on 757 firmware

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ishaang

Senior Member
Mar 24, 2009
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blueether said:
"flash 290" was written a long time ago when it was the 'current' firmware. I would flash 757 first and see how that works out.
Click to expand...
Click to collapse

Oh ok, then I will try that. I have a C6802 but I can't find a 757 FTF for that, so I'm using one for the C6806, I hope that will be fine.

(Found the C6806 at https://www.youtube.com/watch?v=uFSeSe8gQOY through http://xdaforums.com/showthread.php?t=2714511)

Thanks for all your help and for taking out the time! People like you are what makes XDA great for learners and generally everyone, not just devs

---------- Post added at 02:31 PM ---------- Previous post was at 02:26 PM ----------

Sorry, nevermind, found a Ukraine C6802 757 FTF here: http://xdaforums.com/showthread.php?t=2453921
 
blueether

blueether

Senior Member
Jan 21, 2011
3,391
1,639
Te Awamutu, New Zealand
ishaang said:
Oh ok, then I will try that. I have a C6802 but I can't find a 757 FTF for that, so I'm using one for the C6806, I hope that will be fine.

(Found the C6806 at https://www.youtube.com/watch?v=uFSeSe8gQOY through http://xdaforums.com/showthread.php?t=2714511)

Thanks for all your help and for taking out the time! People like you are what makes XDA great for learners and generally everyone, not just devs
Click to expand...
Click to collapse

Yeah c6806 will do, it will make the ZU think it can get the LTE bands but will only connect on 3G

Thanks for the last comments, we all started as noobs
 
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ishaang

Senior Member
Mar 24, 2009
178
25
blueether said:
Yeah c6806 will do, it will make the ZU think it can get the LTE bands but will only connect on 3G

Thanks for the last comments, we all started as noobs
Click to expand...
Click to collapse

So I finally found a download with good speed, for C6806 14.3.A.0.681 (Generic Hong Kong). Flashed it, and now the baseband and imei are back, the phone is fully working, and I have an OTA update notification for 757. Ofcourse, the bootloader is still unlocked and I do not have root access anymore.

Thank you so much blueether, I am glad my phone is back in working order!

I'm still interested in installing Slim though, could you point me in the right direction please?
 
Last edited:
blueether

blueether

Senior Member
Jan 21, 2011
3,391
1,639
Te Awamutu, New Zealand
ishaang said:
So I finally found a download with good speed, for C6806 14.3.A.0.681 (Generic Hong Kong). Flashed it, and now the baseband and imei are back, the phone is fully working, and I have an OTA update notification for 757. Ofcourse, the bootloader is still unlocked and I do not have root access anymore.

Thank you so much blueether, I am glad my phone is back in working order!

I'm still interested in installing Slim though, could you point me in the right direction please?
Click to expand...
Click to collapse

try the [semi] official one? http://xdaforums.com/showthread.php?t=2712065
 
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ishaang

Senior Member
Mar 24, 2009
178
25
blueether said:
try the [semi] official one? http://xdaforums.com/showthread.php?t=2712065
Click to expand...
Click to collapse

Ok so I followed the instructions on LordManhattan's guide down to every letter and managed to do everything right finally. Again, thank you for helping me out and the whole process made things clearer for me now.

Just one last question - now that I have a custom rom working with baseband and imei, and if I want to try a different custom rom like Carbon after a few days, are these the only steps I will have to take to install a new rom:

1. place rom zip and gapps zip on the phone/sd card
2. reboot into recovery
3. wipe data/cache/dalvik
4. install rom and gapps zips
5. reboot

or do I have to first:

i. flash NUT's 532 firmware
ii. Root it using Root_with_Restore_by_Bin4ry
iii. flash boot.zip (I used the one for which links are provided in LordManhattan's guide)
iv. then follow the steps 1 to 5 above
 
Last edited:
blueether

blueether

Senior Member
Jan 21, 2011
3,391
1,639
Te Awamutu, New Zealand
ishaang said:
Ok so I followed the instructions on LordManhattan's guide down to every letter and managed to do everything right finally. Again, thank you for helping me out and the whole process made things clearer for me now.

Just one last question - now that I have a custom rom working with baseband and imei, and if I want to try a different custom rom like Carbon after a few days, are these the only steps I will have to take to install a new rom:

1. place rom zip and gapps zip on the phone/sd card
2. reboot into recovery
3. wipe data/cache/dalvik
4. install rom and gapps zips
5. reboot

or do I have to first:

i. flash NUT's 532 firmware
ii. Root it using Root_with_Restore_by_Bin4ry
iii. flash boot.zip (I used the one for which links are provided in LordManhattan's guide)
iv. then follow the steps 1 to 6 above
Click to expand...
Click to collapse

Just the 5 steps, and I would be tempted to not wipe data, but I like to live dangerously :D If you are inexperienced I would wipe data as well, less likely to have issues.
 
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ishaang

Senior Member
Mar 24, 2009
178
25
blueether said:
Just the 5 steps, and I would be tempted to not wipe data, but I like to live dangerously :D If you are inexperienced I would wipe data as well, less likely to have issues.
Click to expand...
Click to collapse

Everything worked out fine. Thank you blueether.

Turns out Slim has baseband issues for the XZU anyway, so Carbon is working out pretty good for me.
 
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  • 1
    blueether
    blueether
    matthewsucks said:
    So it is okay to directly downgrade from 757?
    And what do you mean by updated firmware to the latest?
    Click to expand...
    Click to collapse

    You want to downgrade to root? if so then yes - see my downgrade sticky thread in the general section for a guide

    After rooting/backing up TA/unlocking bootloader you will want to flash the latest firmware again to get the new baseband, and a few other things else any custom 4.3 or 4.4 ROM's won't boot and/or will have IMEI issues
    View
    1
    blueether
    blueether
    ishaang said:
    Thanks for the response blueether! In the phone settings it says Unknown for both baseband and imei. I found this thread where you helped another person with almost the same problem I guess, (http://xdaforums.com/showthread.php?t=2738141) and you have told him to follow these steps:

    "Just do as has been said a thousand times...
    Downgrade to .532 - see my downgrade thread
    Root using either [NUT]'s dual recovery or bin4ries tool - see thread in step above or LordManhattans guide
    Backup the TA - see LordManhattons guide
    Upgrade to latest FTF
    Unlock bootloader
    Root using jackies099's kernel
    ..."

    So I'm downloading a .532 FTF and will try out these steps once the download finishes in a while. As I understand, when I upgrade to the latest FTF (.757 now?) the imei/baseband should return.
    Click to expand...
    Click to collapse
    IMEI/baseband should be fine if you were on 757 and flashed slim.

    You could just try reflashing any 4.4 FTF you have laying around while you wait for the other one to download
    View
    1
    blueether
    blueether
    ishaang said:
    Not sure why they vanished. Unfortunately I'm sort of a noob and don't have any FTFs lying around. I read some more threads and now I'm wondering what I should try first?

    A - Flash 290 FTF then downgrade to 532
    or
    B - Straightaway flash 532 FTF
    or
    C - Flash 757 FTF
    Click to expand...
    Click to collapse

    "flash 290" was written a long time ago when it was the 'current' firmware. I would flash 757 first and see how that works out.
    View
    1
    blueether
    blueether
    ishaang said:
    Oh ok, then I will try that. I have a C6802 but I can't find a 757 FTF for that, so I'm using one for the C6806, I hope that will be fine.

    (Found the C6806 at https://www.youtube.com/watch?v=uFSeSe8gQOY through http://xdaforums.com/showthread.php?t=2714511)

    Thanks for all your help and for taking out the time! People like you are what makes XDA great for learners and generally everyone, not just devs
    Click to expand...
    Click to collapse

    Yeah c6806 will do, it will make the ZU think it can get the LTE bands but will only connect on 3G

    Thanks for the last comments, we all started as noobs
    View
    1
    blueether
    blueether
    ishaang said:
    So I finally found a download with good speed, for C6806 14.3.A.0.681 (Generic Hong Kong). Flashed it, and now the baseband and imei are back, the phone is fully working, and I have an OTA update notification for 757. Ofcourse, the bootloader is still unlocked and I do not have root access anymore.

    Thank you so much blueether, I am glad my phone is back in working order!

    I'm still interested in installing Slim though, could you point me in the right direction please?
    Click to expand...
    Click to collapse

    try the [semi] official one? http://xdaforums.com/showthread.php?t=2712065
    View

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