Get Fastboot back ! - Onetouch Idol 3 Original Android Development

Very happy to introduce you to lk2nd for the Idol 3 6045* !
Using the "chaining" ability of bootloader, it's possible to add lk2nd to the boot sequence,
thus installing a working fastboot implementation
/!\ WARNING /!\ might not be appropriate if you use stock ROM, since it will overwrite boot partition and you will need a boot.img to use with fastboot, and not just a boot partition dump/backup !
If you use CyanogenMod/LineageOS/SailfishOS it's okay since you can get the boot.img from the ZIP you flashed already.
Install this lk2nd image to /boot partition using either EMMCdl ou Alcatel Flasher.
Then you will be able to "fastboot flash boot your-ROM-boot.img" so your phone starts as usual, and access fastboot/lk2nd using Power+VolumeDown button.
One advantage over the hybrid-MM-boot-stack hack is that lk2nd supports both old and new boot formats
(uncompressed kernel + dt.img AND compressed kernel + appended DT), also no need to downgrade special partitions.
Interesting command : fastboot oem lk_log; fastboot get_staged /dev/stdout
Thanks to Minecrell for the msm8916-lk2nd project and guidance.
Note to 6039* users : don't install this tool, it is for 6045 only ! It should be easy to add support for 6039 to lk2nd.
Download : lk2nd-idol3-20200410-1.img (md5sum : caaa7e91579ebe76472a01505d498026)
This my own build, which doesn't discriminates on panel model unlike the "official" one which only support r63315 panel at the moment.
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XDA:DevDB Information
lk2nd for Idol 3 6045*, Tool/Utility for the Alcatel Onetouch Idol 3
Contributors
vknecht
Source Code: https://github.com/msm8916-mainline/lk2nd/
Version Information
Status: Stable
Created 2020-04-30
Last Updated 2020-04-30

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Dear vknecht, thank you for all your efforts and developing for our Idol 3 6045 phone!
Before installing this lk2nd thing, I wanted to ask the following: If in the future I will install a new LineageOS or Magisk upgrade, will this upgrade overwrite both boot images (lk2nd and LineageOS) and remove fastboot ability again? Or will this upgrade overwrite only LineageOS boot.img, and lk2nd will stay intact?

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Mankann said:
Dear vknecht, thank you for all your efforts and developing for our Idol 3 6045 phone!
Before installing this lk2nd thing, I wanted to ask the following: If in the future I will install a new LineageOS or Magisk upgrade, will this upgrade overwrite both boot images (lk2nd and LineageOS) and remove fastboot ability again? Or will this upgrade overwrite only LineageOS boot.img, and lk2nd will stay intact?
Click to expand...
Click to collapse
Not sure about how Magisk processes/changes boot partition, but for now flashing LineageOS as usual through TWRP will overwrite lk2nd.
Will have to look about integrating lk2nd into LineageOS boot.img...