# iodéOS for Fairphone 4? **URL:** \ **Category:** General Discussion\ **Tags:** Fairphone4\ **Created:** [30 September 2021 22:21 UTC](https://community.iode.tech/t/iodeos-for-fairphone-4/180 "2021-09-30T22:21:23Z")\ **Posts on this page:** 1\ **Showing post:** 76
**Author:** ![AdamKadmon](https://community.iode.tech/letter_avatar_proxy/v4/letter/a/b4bc9f/32.png) [@AdamKadmon](https://community.iode.tech/u/AdamKadmon)\ **Post date:** [25 May 2022 08:12 UTC](https://community.iode.tech/t/iodeos-for-fairphone-4/180/76 "2022-05-25T08:12:17Z")
Flashing slot `b` went smoothly, the system booted into it on restart. Locking the criticals also went well. But when I tried to lock the bootloader, I got the “your device is corrupted and will not boot” message and got stuck in `fastboot` mode. Following @AlphaElwedritsch’s [instructions](https://community.iode.tech/t/fp4-unable-to-relock-bootloader/416/2) from a related thread, I unlocked the bootloader and tried reinstalling from scratch. I flashed the recovery.img to both slots and flashed the custom key, but I’m still stuck in the bootloader. Volume up + power, `fastboot reboot recovery` and selecting recovery from the bootloader menu all bring me back to the bootloader menu. Please, if anyone knows a way out of this, I’ll be very grateful. EDIT 1: It’s OK, changing the current slot got me back into iodeOS. I’ll try sideloading the iodeOS \*.zip from this slot. EDIT 2: Sideload ends with the following error in the terminal (no errors in recovery screen): > serving: ‘iode-2.4-20220407-FP4.zip’ (~94%) adb: failed to read command: Success The phone booted off the previously corrupt slot. I did a dirty flash, so all settings were retained. So I definitely have one of these un-relockable phones, whether it’s a HW or FW thing, something is different in these newer batches. I bought my phone only a week or so ago. It’s a shame I can’t lock this phone down. Thank you, @vince31fr, for your help. --- _[View the full topic](https://community.iode.tech/t/iodeos-for-fairphone-4/180)._