Web installer for FP4 seems to unlock bootloader twice

[piero]

@razanur

an article explaining how to safely re-lock the bootloader

[HOWTO] a Clear Guide to install "IMG-e-builds" when /e/ web installer fails

. [e] . because even well illustrated, the “web-installer” often don’t work, and because the install instructions provided by /e/ can be imbuvable for some new users and can lead to errors. here is a safe guide to install /e/OS . . we take the Fairphone 6 as example, but it is the same logical and quite the same process for all the devices that have : only "IMG-e-xxxxxxxxxxx.zip" file on their download page, no "recovery-e-xxxxxxxxxx.img" file on their download page, no "recove…

@piero

If you plan to relock the bootloader after the installlation

this is not mandatoty, and only available with Official version, why relocking ?

Most important thing to take care about is the “android Security Update" aka "Security Patch Level” date (SPL) included in the installed Operating System on your device at time of the unlock.

new version on witch you want to relock the bootloader, must included a NEWER (or the same) “android Security Update" aka "Security Patch Level” date (SPL),

otherwise you risk to change your device into Brick.

@piero

• check bootloader status by running :

./fastboot oem device-info

./fastboot flashing get_unlock_ability

if the return is 1

→ you will be able to relock

if the return is 0

→ locking should be feasible, BUT you will not be able to unlock again in the future…
→ it is advised to

• reboot and re-enable Developer Options, USB debugging and allow OEM unlocking . (to get =1),
  or
• reinstall FairphoneOS and re-enable Developer Options, USB debugging and allow OEM unlocking . (to get =1), and then reinstall /e/OS.