Cannot flash lineageos on FP4

i want to install lineageos on my fairphone 4
i follow this guide :

the FP4 is on fastboot mode
but i have this response from the script

sudo ./

*** Fairphone 4 flashing script ***

INFO: The procedure will start soon. Please wait…
INFO: The package type is “user-factory”
INFO: The build number is “SP21”
INFO: You are using macOS.

INFO: Validating the integrity of the package.
This might take a while. Please wait…
INFO: Validation complete.
WARNING: Flashing this image wipes all user data and settings on the phone.
It will also remove the Google factory reset protection.
Are you sure you want to continue?
Type “Yes” (case sensitive) and press enter to continue: Yes
INFO: Looking for connected device(s)…
INFO: One Fairphone 4 in fastboot mode found (serial number: xxxxxxx).

→ the script stop here
nothing is installed
the device is unlocked
thanks for your help

Why don’t you follow this instruction if you want to install LineageOS? Install LineageOS on FP4 | LineageOS Wiki

The guide you’ve mentioned is for installing stock OS…

1 Like

hello, thanks for your response, i follow first this link : Install LineageOS on FP4 | LineageOS Wiki
but i had a signature problem after the sideload process …

What do you mean with that? Please show the exact error message.

ok i follow the instructions
i am in recovery mode but i have this error when i want to sideload
adb -s mydeviceid sideload
adb: sideload connection failed: closed
adb: trying pre-KitKat sideload method…
adb: pre-KitKat sideload connection failed: closed

adb devices
List of devices attached
mydeviceid recovery

edit → ok i forgot * On the device, select “Apply Update”, then “Apply from ADB” to begin sideload.

thanks it works, now i must root it, do you have a link to follow ?

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