The next release will not solve the problem, as an additional step is required in the bootloader. You can follow the updated instructions on iode / ota · GitLab. In brief for you:
- download https://github.com/iodeOS/ota/releases/download/v2-FP4/avb_custom_key-FP4.bin
- fastboot flash avb_custom_key avb_custom_key-FP4.bin
This defines iodéOS custom key as a root of trust used by the bootloader to verify rom authenticity, and permits to boot when the bootloader is relocked.