Bootloader, Anti Roll Back and stuff

Hello while installing a third party OS i got myself into Android Anti-rollback protection. I’m stuck on bootloader screen, and when i hit start i have the orange custom OS showing then it loops until i hit volume down and get back in bootloader.
get_unlock_ability :
.\fastboot.exe flashing get_unlock_ability : (bootloader) get_unlock_ability: 1

My current Bootloader version : FP6.QREL.15.151.0

the OS i try to install IODEos

I think if i can have the phone to not try to boot on the broken OS i could use the technique i used in my last topic : Issues with custom ROM and rollback to FPos with the manual install software - #19 by r4Zi

Can you help me ?

i don’t think so, because only relocking bootloader can leads you into Android Anti-rollback protection

so just boot the device into bootloader mode…

.

simply use iodé files following instructions from :

A clear guide to install alternative OS on your Fairphone

Thank’s @piero-e i’ll check the guide, i understand the major part of it but i might lose some bits as english is not my native language.

I’m sorry but i’m not as natural about at this as you so if you please can explain what is bootloader mode ? As i read through the forum, sometimes bootloader is mentionned when you press vol- + power but some people call it fastboot mode. there is also people saying that bootloader is when you are in vol- + power mode and then you type fastboot reboot fastboot so i’m confused about the word i should use or the real word i should use because i lack of documentation about all off this

i have edited the previous post.

Thank you i’ll use the guide for now :slight_smile: