Cannot flash lineageos on FP4

[gco]

Hello
i want to install lineageos on my fairphone 4
i follow this guide : https://support.fairphone.com/hc/en-us/articles/4436167982097

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

sudo ./flash_fp4_factory.sh

*** 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

[Volker]

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…

[gco]

@Volker

Install LineageOS on FP4 | LineageOS Wiki

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 …

[askaaron]

@gco

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.

[gco]

ok i follow the instructions
i am in recovery mode but i have this error when i want to sideload
adb -s mydeviceid sideload lineage-20.0-20230402-nightly-FP4-signed.zip
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 ?

[yvmuell]

FP4 Root Access is possible, maybe a bit risky

Hello out there, i once used an FP1 - but after some years it was to slow and to limited for my usage - and finally the USB Connector broke… After that i used a rooted LG G6 - in between flashed with HavocOS (also rooted) “If you can’t open it you don’t own it” was printed on the back of my 3d printed FP1 Case. And when i am no root - i can’t use my device as an open device - it has still some locked rooms. Right now i am at a point where i was with my FP1 when the usage ended (excelt the bro…